Red Sea

Geography glossary

Topic: World Physical Features and Natural Regions · NCERT: Beyond NCERT

Meaning

The Red Sea is a long, narrow arm of salt water between north-east Africa and the Arabian Peninsula. It formed when the African plate and the Arabian plate pulled apart (rifting). In the north it joins the Mediterranean Sea through the Suez Canal, and in the south it joins the Gulf of Aden through the Bab-el-Mandeb strait.

It matters because it lies on the main Asia–Europe shipping route. It is also one of the best examples of a young rift sea that is still getting wider.

Explanation

How it formed (cause → process → result)

  • Cause: two plates move apart.
  • The African plate and the Arabian plate are pulling away from each other.

  • This is called rifting (two plates pull apart, and the land between them sinks into a long valley).

  • Process: the crust stretches and sinks.

  • The crust between the plates stretched and became thinner.
  • The thin crust sank and made a long, deep trough.

  • Sea water flooded into the trough.

  • Result: a long, narrow sea that is still widening.

  • This explains the Red Sea's shape: long, narrow and with straight sides.
  • The plates are still moving apart, so the sea is still slowly getting wider.
  • It belongs to the same rift system as the East African Rift Valley. That is why examiners call it a "young ocean in the making".

Parts and links

  • Main body: runs from north-west to south-east between Africa and Arabia.
  • Two northern arms, one on each side of the Sinai Peninsula:
Arm Side of Sinai Key point
Gulf of Suez West Leads to the Suez Canal
Gulf of Aqaba East Ports of Aqaba (Jordan) and Eilat (Israel)
  • Northern outlet: the Suez Canal (in Egypt) joins it to the Mediterranean Sea.
  • Southern outlet: the Bab-el-Mandeb strait joins it to the Gulf of Aden, then the Arabian Sea. The strait lies between Yemen on one side and Djibouti or Eritrea on the other.

Why the water is very salty (textbook fact)

  • Hot desert climate: the sea lies in a hot, dry belt, so a lot of water evaporates.
  • Little fresh water comes in: there is very little rain, and no big river flows into it.
  • Partly closed basin: it opens to the ocean only through the narrow Bab-el-Mandeb, so it mixes little with open ocean water.
  • Result: the Red Sea is one of the saltiest seas in the world. It is a standard example of how climate and relief control the salinity (saltiness) of a sea.

Why it is a chokepoint route

  • A chokepoint is a narrow strait that many ships must pass through. If it is blocked, world trade slows down.
  • The Red Sea route has two chokepoints: Suez in the north and Bab-el-Mandeb in the south.
  • If either one is unsafe, ships between Asia and Europe have to sail all the way around Africa, past the Cape of Good Hope.

Where it occurs

  • Bordering countries:
  • African side: Egypt, Sudan, Eritrea, Djibouti.
  • Arabian side: Yemen, Saudi Arabia.

  • At the tip of the Gulf of Aqaba: Jordan and Israel.

  • Sinai Peninsula (Egypt): lies between the Gulf of Suez (west) and the Gulf of Aqaba (east).

  • Bab-el-Mandeb: at the southern end, between Yemen and Djibouti or Eritrea. It is guarded by the Horn of Africa (Somalia, Ethiopia, Eritrea, Djibouti).
  • Djibouti: a small country beside Bab-el-Mandeb that hosts many foreign military bases. China's first overseas military base opened here in 2017.
  • East African Rift Valley: the land part of the same rift system, running south through East Africa.
  • Link to India:
  • From late 2023, attacks on merchant ships in the Red Sea and Gulf of Aden made many ships avoid Suez and sail around the Cape of Good Hope.
  • The Indian Navy stepped up maritime security operations from 14 December 2023 [1].
  • From 14 December 2023 to 23 March 2024 these operations saved more than 110 lives, including 45 Indian seafarers, and escorted about 15 lakh tonnes of key goods (fertiliser, crude oil and petroleum products) [1].

Don't confuse with

  • Persian Gulf: it is a shallow arm of the Indian Ocean between Iran and Arabia. Its outlet is the Strait of Hormuz, not Bab-el-Mandeb. It was not formed by rifting the way the Red Sea was.
  • Gulf of Aden: it is an arm of the Arabian Sea between Yemen (north) and Somalia (south). It lies outside Bab-el-Mandeb. The Red Sea lies inside it.
  • Gulf of Suez vs Gulf of Aqaba: both are arms of the Red Sea. Suez is west of Sinai and leads to the canal. Aqaba is east of Sinai and has the ports of Aqaba (Jordan) and Eilat (Israel).
  • Black Sea: it is an inland sea between Europe and Asia. Big rivers keep its surface water low in salt, and its deep water has no oxygen. The Red Sea is the opposite: it gets no big river, so it is very salty.

Prelims Hooks

  • The Red Sea formed by rifting of the African and Arabian plates. It is part of the East African Rift system and is still widening.
  • Bab-el-Mandeb joins the Red Sea and the Gulf of Aden. Hormuz joins the Persian Gulf and the Gulf of Oman. These two pairs are a common trap.
  • Gulf of Suez = west of Sinai. Gulf of Aqaba = east of Sinai (Aqaba port in Jordan, Eilat port in Israel).
  • Bordering countries: Egypt, Sudan, Eritrea, Djibouti, Yemen, Saudi Arabia, plus Jordan and Israel at the Gulf of Aqaba. Somalia does not border the Red Sea. It borders the Gulf of Aden.
  • The Suez Canal is in Egypt. It joins the Red Sea to the Mediterranean.
  • The Indian Navy stepped up maritime security operations in the Red Sea and Gulf of Aden region from 14 December 2023 [1].

Mains Points

  • Physical geography (GS-I): the Red Sea as a young rift sea.
  • The plates pull apart, the crust thins and sinks, and the sea floods the trough.
  • It shows how a continent can split and a new ocean basin can begin. It is linked to the East African Rift Valley.

  • Its high salinity comes from strong evaporation, little rain, no big river inflow and a narrow link to the ocean. It is a good example of how climate and relief shape the salinity of a sea.

  • Chokepoints and India's trade and energy security (GS-III):

  • Suez and Bab-el-Mandeb carry India's trade with Europe and part of its energy imports.
  • The 2023-24 attacks made ships go around the Cape of Good Hope. This raised freight costs and delayed cargo.

  • India responded with naval operations from 14 December 2023: nearly 1,000 boarding operations, more than 3,000 kg of narcotics seized, and key cargo escorted [1]. This adds to its Gulf of Aden anti-piracy patrols running since October 2008 [2].

  • Geopolitics of the Horn of Africa (GS-II link):

  • The Horn of Africa guards Bab-el-Mandeb, so outside powers want a presence there. One example is China's first overseas base in Djibouti (2017).
  • Ethiopia has been landlocked since Eritrea became independent in 1993. Its 2024 sea-access deal with Somaliland raised tension in the region (verify current).

Related concepts

Read more

Sources

  1. 1PIB — Indian Navy's ongoing maritime security operations (Op SANKALP), 14 Dec 23 to 23 Mar 24pib.gov.in · tier 1
  2. 2Ministry of Defence FAQ — How is India securing its trade route from pirates?mod.gov.in · tier 1