India and her Neighbours

1. Framing the neighbourhood: land, sea and region

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• India's land boundary: Class 7 gives "over 15,100 km". It passes through deserts, plains, forests, mountains, marshes and river valleys. MHA total: 15,106.7 km, shared with seven countries.

Neighbour	km (MHA)	Neighbour	km (MHA)
Bangladesh	4,096.7	Myanmar	1,643
China	3,488	Bhutan	699
Pakistan	3,323	Afghanistan	106
Nepal	1,751

• Longest frontier = Bangladesh (Class 11 MCQ). Afghanistan's 106 km is claimed only. It runs through Gilgit-Baltistan, which is held by Pakistan, to the Wakhan Corridor (Section 3).
• Maritime neighbour: a country joined to India by a shared sea, even with no land border. Sri Lanka and the Maldives are India's two island neighbours (Class 11). The wider ring takes in Iran, Oman, Thailand, Malaysia, Singapore and Indonesia. India shares maritime boundaries with Sri Lanka, Maldives, Indonesia, Thailand, Myanmar, Bangladesh and Pakistan (verify current).
• Gulf vs strait: a gulf is a large arm of the sea that cuts into land. A strait is a narrow waterway that joins two seas.
• Regionalism: neighbours working together for peace and shared progress.
• SAARC: set up on 8 December 1985 in Dhaka with seven members. Afghanistan joined in 2007, making eight. The secretariat is in Kathmandu. No summit has been held since 2014, and the 2016 Islamabad summit was called off.
• Other groupings: BIMSTEC (1997; charter in force 2024) and IORA (1997).
• Border villages: MHA runs the Border Area Development Programme and the Vibrant Villages Programme (2023).

2. China: the Himalayan boundary

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• India-China boundary: about 3,488 km along the Himalayas. Indian states and UTs on it, east to west: Arunachal Pradesh, Sikkim, Uttarakhand, Himachal Pradesh, Ladakh. China is about three times India's area (Class 7).
• Line of Actual Control (LAC): the de facto line (the line each side actually holds). It has never been jointly marked on the ground. It has three sectors:
• Western (Ladakh): India claims Aksai Chin, about 38,000 sq km of high cold desert. China has held it since the 1950s, when it built the Xinjiang-Tibet road (G219) through it. India also claims the Shaksgam valley (about 5,180 sq km, north of the Karakoram), which Pakistan ceded to China in 1963. India rejects that transfer.
• Middle (Himachal Pradesh, Uttarakhand): the least disputed sector (Barahoti).

• Eastern (Sikkim, Arunachal Pradesh): the McMahon Line, drawn at the Simla Convention (1914) along the crest of the eastern Himalaya. China rejects it, claims Arunachal as "Zangnan" and keeps "renaming" places there (verify current).

• Galwan valley: the Galwan river is a tributary of the Shyok. On 15 June 2020, 20 Indian soldiers died in a clash here. Disengagement agreements covering the other friction points ran up to October 2024 (verify current).

• Mount Kailash (about 6,638 m, Tibet) and Lake Mansarovar are sacred to Hindus, Buddhists, Jains and Bon followers. Indian pilgrims reach them via Lipulekh (Uttarakhand) and Nathu La (Sikkim); the yatra resumed in 2025 (verify current). The Indus, Satluj and Brahmaputra rise nearby, so China is upstream of India on all three.
• Cultural links (Class 7):
• Buddhism reached China around the 1st century CE.
• Faxian and Xuanzang came to India to study. Bodhidharma and Kumarajiva went from India to China.
• Hindu merchants built temples at Quanzhou in the 13th century (Kaiyuan temple).

3. Pakistan and Afghanistan: the north-western frontier

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• India-Pakistan border: about 3,323 km, along Gujarat, Rajasthan, Punjab, J&K and Ladakh.

• Class 7: Pakistan was part of India until the 1947 Partition. Wars followed in 1948, 1965 and 1971, then Kargil in 1999.

• Radcliffe Line: drawn by Sir Cyril Radcliffe and announced on 17 August 1947. It divided Punjab and Bengal, so it is also the base of the Bangladesh border. From Gujarat to Jammu it is the fenced International Border.

• Line of Control (LoC): about 740 km in J&K.
• It began as the 1949 Karachi ceasefire line and was renamed by the Simla Agreement in 1972.

• It ends at point NJ9842. North of that lies the Siachen glacier: about 76 km long, in the eastern Karakoram, and it feeds the Nubra river. India has held it and the Saltoro ridge since Operation Meghdoot (1984). It is the world's highest battlefield.

• Sir Creek: a 96 km tidal estuary in the Rann of Kachchh marshes, between Gujarat and Sindh. India and Pakistan dispute where the line runs in it, which decides their maritime boundaries and EEZs (the sea zone where a country controls fishing and resources).

• Kartarpur Corridor: opened on 9 November 2019. It links Dera Baba Nanak (Gurdaspur) to Gurdwara Darbar Sahib, where Guru Nanak spent his last 18 years. Pilgrims need only a permit, no visa. India suspended it from 7 May 2025 (verify current).
• Indus Waters Treaty (1960): India got the eastern rivers (Ravi, Beas, Satluj). Pakistan got most use of the western rivers (Indus, Jhelum, Chenab). India put it "in abeyance" in April 2025 (verify current).
• Afghanistan (Class 7, "land-locked neighbour"):
• Ancient links: the Uttarapatha route, the Bamiyan Buddhas (destroyed in 2001).
• India built the Afghan Parliament and the Zaranj-Delaram highway, which joins Asian Highway 1.
• Durand Line (1893, about 2,640 km): agreed by Abdur Rahman Khan and Mortimer Durand. Afghanistan has never accepted it.
• Wakhan Corridor: a thin strip of Afghanistan between Tajikistan and PoK that touches China. India's claimed 106 km border lies here.
• Khyber Pass: crosses the Spin Ghar range from Peshawar to Kabul. With the Bolan Pass (near Quetta), it was a historic gateway for invasion and trade.

4. Nepal and Bhutan: the Himalayan kingdoms and the Siliguri Corridor

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• India-Nepal border: about 1,751 km and open, along Uttarakhand, Uttar Pradesh, Bihar, West Bengal and Sikkim. Citizens cross without passports or visas.
• India-Nepal Treaty of Peace and Friendship (1950): provides for an open border and free movement of people and goods. Each country treats the other's citizens like its own, and the two cooperate on defence and foreign affairs. Nepal wants the treaty revised (verify current).
• Cultural links: Pashupatinath temple (Kathmandu); Dashain, Tihar and Holi.
• Kalapani-Lipulekh-Limpiyadhura: about 335 sq km at the India-Nepal-China tri-junction in Pithoragarh (Uttarakhand). India holds it. Nepal put it on its new map in May 2020. The dispute is over which stream is the source of the Kali river under the Sugauli Treaty (1816).
• Mahakali Treaty (1996): covers the Sarada and Tanakpur barrages and the long-stalled Pancheshwar project. Earlier river deals: Kosi (1954) and Gandak (1959).
• India-Bhutan relations:
• "Druk Yul" (Land of the Thunder Dragon). Its 699 km border touches Sikkim, West Bengal, Assam and Arunachal Pradesh.
• Rivers such as the Sankosh, Manas, Raidak and Torsa flow into India and drive hydropower. Tala (1,020 MW) was dedicated in 2008; Mangdechhu followed in 2019.
• Padmasambhava brought Vajrayana Buddhism in the 8th century CE.

• Bhutan measures progress by Gross National Happiness. The friendship treaty was revised in 2007.

• Doklam: a plateau near the India-Bhutan-China tri-junction, claimed by both Bhutan and China. It saw a 73-day India-China standoff (June-August 2017) over a Chinese road.

• Chumbi valley: a wedge of Tibet between Sikkim and Bhutan. It points at the Siliguri Corridor ("chicken's neck").
• Siliguri Corridor: about 20-22 km wide at its narrowest, in north West Bengal between Nepal and Bangladesh. It is the North-East's only land link to the rest of India for roads, rail and pipelines.

5. Bangladesh: the longest border and shared rivers

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• India-Bangladesh border: 4,096.7 km, India's longest. It runs along West Bengal, Assam, Meghalaya, Tripura and Mizoram. West Bengal has the longest stretch (about 2,217 km; verify current).
• Bangladesh (once East Pakistan) was born in 1971. Bangla is shared with West Bengal (Class 7).

• Rivers, chars (sandy river islands) and crowded plains make fencing hard. They also make smuggling and illegal migration hard to stop.

• Land Boundary Agreement 2015: it carries out the 1974 Indira-Mujib pact and the 2011 Protocol, through the Constitution (100th Amendment) Act 2015.

• On 31 July 2015, 111 Indian enclaves in Bangladesh were swapped for 51 Bangladeshi enclaves in India. (An enclave is a piece of one country lying completely inside another.) Most were around Cooch Behar.
• Residents chose their citizenship.
• About 6.1 km of unmarked border was fixed.

• The Bay of Bengal sea boundary was settled by arbitration in 2014.

• Transboundary rivers: India and Bangladesh share 54 rivers (Joint Rivers Commission, 1972).

• Ganga (Padma): Farakka barrage (1975). The Ganga Waters Treaty (1996, for 30 years) expires in 2026 (verify current).
• Brahmaputra (Jamuna).
• Teesta: no water-sharing deal has been signed.
• Kushiyara: interim deal in 2022.

• Feni: Maitri Setu bridge (2021).

• Sundarbans: the world's largest mangrove forest and a UNESCO site. About two-thirds lies in Bangladesh (Class 7). It is home to the Bengal tiger and shields the coast from cyclones. Rising seas threaten it.

6. Myanmar: gateway to Southeast Asia

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• India-Myanmar border: about 1,643 km, along Arunachal Pradesh, Nagaland, Manipur and Mizoram. It runs through the Patkai, Naga, Manipur and Mizo hills, and part of it follows the Tiau (Tio) river (Mizoram).
• Cultural links (Class 7):
• Buddhist pilgrims travel between the two countries.
• India helped restore the Ananda temple at Bagan after earthquake damage.

• India gifted a Sarnath Buddha replica to the Shwedagon Pagoda (Yangon).

• Free Movement Regime (FMR): hill peoples on both sides (Nagas, Kuki-Chin-Mizo peoples) could go up to 16 km across the border without a visa. The Land Border Crossing Agreement (2018) made it formal.

• Why it was cut back: the Manipur violence (2023) and Myanmar's civil war after 2021.
• What changed: in February 2024 the Centre said it would scrap the FMR and fence the whole border. A pass-based system with a smaller zone followed (verify current).

• Pushback: Mizoram and Nagaland object because their kin live across the border.

• India-Myanmar-Thailand Trilateral Highway: about 1,360 km, from Moreh (Manipur) via Mandalay and Bagan to Mae Sot (Thailand). Some sections are still incomplete (verify current).

• Kaladan project: ships go from Kolkata to Sittwe port, boats go up the Kaladan river to Paletwa, and a road runs on to Zorinpui (Mizoram). It bypasses the Siliguri Corridor.
• Arakan Yoma: a mountain range along Myanmar's west coast.
• It turns the Bay of Bengal branch of the monsoon towards Bangladesh and North-East India.
• The Andaman and Nicobar Islands are its continuation under the sea.

7. Sri Lanka and the Maldives: the island neighbours

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• Sri Lanka: an island southeast of India. At the nearest point it is about 32 km away across the Palk Strait (Class 7). Class 11 adds that the Gulf of Mannar also separates the two.
• Ashoka's son Mahendra and daughter Sanghamitra took Buddhism there in the 3rd century BCE.

• The civil war (mid-1980s to around 2010) between the Sinhalese majority and the Tamil minority sent Tamil refugees to Tamil Nadu.

• Palk Strait: a narrow, shallow strait between Tamil Nadu and northern Sri Lanka. It joins the Bay of Bengal to Palk Bay.

• Adam's Bridge (Rama Setu): a 48 km chain of limestone shoals (shallow sandbanks and rocks). It runs from Pamban (Rameswaram) Island to Mannar Island and separates Palk Bay from the Gulf of Mannar. The Sethusamudram canal project, which would cut through it, is stalled.
• Gulf of Mannar: a shallow inlet south of Adam's Bridge with coral reefs, seagrass and dugongs. It is India's first marine biosphere reserve (1989), and its marine national park covers 21 islands.
• Katchatheevu: a small uninhabited islet in the Palk Strait. The 1974 agreement recognised it as Sri Lankan, and the 1976 agreement limited Indian fishing. Arrests of Tamil Nadu fishers keep it in the news (verify current).
• Maldives:
• Over 1,100 coral islets in 26 atolls, about 130 km from Minicoy (Lakshadweep) across the Eight Degree Channel.
• Dhivehi has borrowed words from Sanskrit, Tamil and Malayalam (raajje, mas, dhoni). The Boduberu dance echoes Tamil folk rhythms.
• Independent in 1965. India helped in 2004 (tsunami), 2014 (Male water crisis) and during COVID-19.
• Its seas may rise 1 m by 2100, and its cabinet met underwater in 2009.
• It is an International Solar Alliance member.

8. The wider maritime neighbourhood: Southeast Asia, Iran and Oman

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• Suvarnabhumi / Suvarnadvipa ("golden land / island"): the old Indian name for Java, Sumatra and Malaya, which Indian traders reached from a few centuries BCE.
• Thailand (shares a maritime boundary with India):
• The Dvaravati culture (6th-11th centuries CE) was named after Dvaraka.
• The Ayutthaya kingdom (founded 1351) was named after Ayodhya.
• Every Chakri king is called Rama; the present one is Rama X.

• A samudra manthana sculpture stands at Suvarnabhumi airport.

• Malaysia: took up a Brahmi-based script around the 4th century CE and was mostly Muslim by the 15th century. About 9 per cent of the people are of Indian origin (NCERT; verify current).

• Singapore ("Singapuram", lion city): a separate nation from 1965. Tamil is an official language.
• Indonesia:
• Over 17,000 islands. Borobudur (8th-9th century CE) is the world's largest Buddhist monument, and the Garuda appears on the rupiah.
• The 26 December 2004 tsunami killed about 15,000 people in India and over 200,000 across the region. As a result, the Indian Tsunami Early Warning Centre at INCOIS, Hyderabad, was set up (working from 2007).

• Indira Point is about 150 km from Indonesia across the Six Degree Channel.

• Iran: the Avesta has parallels with the Rigveda, and Persian was the Mughal court language.

• Chabahar port (Shahid Beheshti terminal, Gulf of Oman, Sistan-Baluchestan) gives India access to Afghanistan and Central Asia that bypasses Pakistan.
• A trilateral pact was signed in 2016 and a 10-year operating contract on 13 May 2024.

• It links to the INSTC (International North-South Transport Corridor), but US sanctions cloud the project (verify current).

• Oman ("land of copper"):

• It sent copper ingots to Harappan cities. Over 10 per cent of its people are of Indian origin.
• It is India's closest Gulf defence partner, holding exercises with all three services.

9. The map drill: border states, chokepoints and corridors

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Neighbour	Indian states/UTs on the border
China	Ladakh, Himachal Pradesh, Uttarakhand, Sikkim, Arunachal Pradesh
Pakistan	Gujarat, Rajasthan, Punjab, J&K, Ladakh
Nepal	Uttarakhand, Uttar Pradesh, Bihar, West Bengal, Sikkim
Bhutan	Sikkim, West Bengal, Assam, Arunachal Pradesh
Bangladesh	West Bengal, Assam, Meghalaya, Tripura, Mizoram
Myanmar	Arunachal Pradesh, Nagaland, Manipur, Mizoram
Afghanistan	Ladakh (claimed, via PoK)

• Three neighbours each: Sikkim (China, Nepal, Bhutan), West Bengal (Bangladesh, Nepal, Bhutan) and Arunachal Pradesh (China, Bhutan, Myanmar).
• Odd cases: Mizoram touches Bangladesh and Myanmar. Uttar Pradesh touches only Nepal. Tripura is almost surrounded by Bangladesh.
• Terrain → border force:
• Glaciers and high plateaus (China) → ITBP.
• The Thar desert and Rann marshes (Pakistan), and deltas and chars (Bangladesh) → BSF.
• The Tarai (Nepal) and Duars (Bhutan) → SSB.

• Forested hills (Myanmar) → Assam Rifles.

• Sea chokepoints (narrow sea passages that much shipping must use): Strait of Hormuz, Bab-el-Mandeb, Malacca Strait (with Sunda and Lombok as alternatives), and the Six, Nine, Ten and Eight Degree channels. Also the Coco Channel. The Andaman and Nicobar Islands sit on the approach to Malacca.

• "String of Pearls" ports (Gwadar, Hambantota, Kyaukphyu) are covered in polity's india-external-relations.

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Exam angles

Prelims — high-yield facts and traps

• Border lengths: Bangladesh > China > Pakistan > Nepal > Myanmar > Bhutan > Afghanistan; total about 15,107 km (MHA).

• "China has India's longest border" — FALSE.

• States and neighbours:

• Sikkim, West Bengal and Arunachal Pradesh each touch three countries.
• Uttar Pradesh touches only Nepal. Mizoram touches Bangladesh and Myanmar.

• "Assam borders Myanmar" — FALSE.

• Lines:

• Durand (1893): Afghanistan-Pakistan.
• McMahon (1914, Simla): Arunachal-Tibet.
• Radcliffe (17 August 1947).
• LoC: Karachi 1949, renamed at Simla 1972, ends at NJ9842.

• LAC: de facto, three sectors, never jointly marked.

• Places to locate:

• Aksai Chin and Galwan (Shyok tributary) in Ladakh.
• Shaksgam, ceded by Pakistan to China in 1963.
• Siachen (feeds the Nubra) and the Saltoro ridge.
• Doklam and the Chumbi valley.
• Siliguri Corridor (about 20-22 km).

• Kalapani (Pithoragarh); Sir Creek (Rann of Kachchh); Katchatheevu (Palk Strait); Wakhan; Khyber (Spin Ghar).

• Water bodies:

• Palk Strait → Palk Bay → Adam's Bridge → Gulf of Mannar, north to south.
• Eight Degree Channel: Minicoy-Maldives. Six Degree Channel: Great Nicobar-Sumatra.

• "Adam's Bridge lies south of the Gulf of Mannar" — FALSE.

• Agreements:

• Indus Waters Treaty 1960 (eastern rivers to India).
• Ganga Waters Treaty 1996 and Mahakali Treaty 1996.
• India-Nepal Treaty 1950.
• LBA 2015: 100th Amendment; 111 Indian and 51 Bangladeshi enclaves swapped.

• LBCA 2018: FMR of 16 km.

• Connectivity:

• Chabahar (Gulf of Oman); Kaladan (Sittwe); Trilateral Highway (Moreh-Mae Sot).

• Kartarpur (Dera Baba Nanak); Zaranj-Delaram (Afghanistan).

• Cultural pairs:

• Dvaravati-Dvaraka; Ayutthaya-Ayodhya; Borobudur-Indonesia; Bamiyan-Afghanistan.

• Padmasambhava-Bhutan; Mahendra and Sanghamitra-Sri Lanka; Faxian and Xuanzang-China; Ananda temple-Bagan.

• SAARC: 1985, Dhaka, eight members, secretariat in Kathmandu.

Mains — GS-I themes

1. How terrain, rivers and narrow corridors make it hard to guard India's northern and eastern borders.
2. Transboundary rivers (Indus, Ganga, Teesta, Brahmaputra) as a source of both cooperation and conflict.
3. The Siliguri Corridor and the North-East's weak links; alternatives such as Kaladan and transit through Bangladesh.
4. Open vs closed borders: the India-Nepal open border and the India-Myanmar FMR, with their benefits and security costs.
5. India's ancient links with Southeast Asia as the base for the Act East policy.
6. Why the island neighbours and the Indian Ocean chokepoints matter strategically.

Current-affairs hooks

• LAC patrolling deals, border infrastructure, and China renaming places in Arunachal (verify current).
• Indus Waters Treaty "in abeyance" since April 2025; India's projects on the western rivers (verify current).
• Ganga Waters Treaty renewal (it expires in 2026) and the Teesta deal (verify current).
• FMR changes, fencing of the Myanmar border, Manipur, and Myanmar's civil war (verify current).
• Kartarpur Corridor suspension; Kailash Mansarovar Yatra routes (verify current).
• Katchatheevu and arrests of Palk Bay fishers; Chabahar under US sanctions (verify current).