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Important Seas Of The World

Seas are smaller than oceans in terms of geography and are usually located where the land and ocean meet. Typically, Seas are partially enclosed by land. Seas have great geographical, Political, and Economic significance.

In oceanography, a marginal sea is a sea partially enclosed by islands, archipelagos, or peninsulas.

Some of the major marginal seas include the Arabian Sea, Baltic Sea, Bay of Bengal, Bering Sea, Black Sea, Gulf of California, Gulf of Mexico, Mediterranean Sea, Red Sea, and all four of the Siberian Seas (Barents, Kara, Laptev, and East Siberian).

The primary differences between marginal seas and open oceans are associated with depth and proximity to landmasses. Marginal seas, which are generally shallower than open oceans, are more influenced by human activities, river runoff, climate, and water circulation.

Major (Important) Seas of the world

  1. Arabian Sea
  2. South China Sea
  3. East China Sea
  4. Coral Sea
  5. Caribbean Sea
  6. Mediterranean Sea
  7. Ionian Sea
  8. Bay of Bengal
  9. Arabian Sea
  10. Bering Sea
  11. Sea of Okhotsk
  12. Gulf of Mexico
  13. Tasman Sea
  14. Hudson Bay
  15. Sea of Japan
  16. Sea of Azov
  17. Caspian Sea
  18. Adriatic Sea
  19. Baltic Sea
  20. Red Sea
  21. Yellow Sea
  22. Dead Sea
  23. Black Sea
  24. Tyrrhenian Sea
  25. Ligurian Sea
  26. Balearic Sea
  27. Alboran Sea
  28. Sargasso Sea
  29. The Aegean Sea…

Arabian Sea

The Arabian Sea is a region of the northern Indian Ocean bounded on the north by Pakistan, Iran, and the Gulf of Oman, on the west by the Gulf of Aden, Guardafui Channel, and the Arabian Peninsula, on the southeast by the Laccadive Sea, on the southwest by the Somali Sea, and the east by India.

The Gulf of Aden in the west connects the Arabian Sea to the Red Sea through Bab-el-Mandeb's strait, and the Gulf of Oman is in the northwest, connecting it to the Persian Gulf.

Important Seas | Geography for UPSC CSE


South China Sea

Places here are China, Vietnam, Hainan, Malaysia, and the Philippines. China is involved in disputes with many countries here. Places in dispute are Paracel, Scarborough Shoal, and The Spratly Islands.

Important Seas | Geography for UPSC CSE


East China Sea

The East China Sea is a marginal sea of the Western Pacific Ocean, located directly offshore from East China.

Towards the east of this sea are the Japanese islands of Kyushu and the Ryukyu Islands, towards the south of it is the South China Sea and to the west by the Asian continent. The sea connects with the Sea of Japan through the Korea Strait and opens to the north into the Yellow Sea. The countries which border the sea include South Korea, Japan, the Republic of China (Taiwan) and the People’s Republic of China.

In recent times, tensions between China and Japan have risen over the contested Senkaku/Diaoyu islands that lie in this sea. Both nations have raised as incursions into the disputed waters. Both countries have increased their military capabilities, particularly their radar and missile systems, in the region.

Important Seas | Geography for UPSC CSE

Adriatic Sea

The Adriatic Sea is a part of the Mediterranean Sea positioned between Italy's eastern coastline and countries of the Balkan Peninsula, from Slovenia, South through Croatia, Montenegro, and to Albania.

  • The Adriatic Sea is a body of water separating the Italian Peninsula from the Balkan Peninsula.
  • The countries with coasts on the Adriatic are Albania, Bosnia and Herzegovina, Croatia, Italy, Montenegro, and Slovenia.

Important Seas | Geography for UPSC CSE

Black Sea

The Black Sea is an inland sea located between far-southeastern Europe and the far-western edges of the continent of Asia and Turkey. Turkey borders it, and by Bulgaria, Romania, Ukraine, Russia, and Georgia.

Important Seas | Geography for UPSC CSE

The Caspian Sea

The Caspian Sea is an enclosed body of water between Asia and Europe. It is bordered by Iran, Turkmenistan, Kazakhstan, Azerbaijan, Russia.

Important Seas | Geography for UPSC CSE

Mediterranean Sea

The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Southern Europe and Anatolia, south by North Africa, and on the east by the Levant.

Sargasso Sea

  • While all other seas in the world are defined at least partly by land boundaries, the Sargasso Sea is defined only by ocean currents.
  • It is bounded on the west by the Gulf Stream, north, by the North Atlantic Current, east, by the Canary Current, and south, by the North Atlantic Equatorial Current.
  • This system of ocean currents forms the North Atlantic Gyre.
  • It is the only sea on Earth which has no coastline.

Red Sea

The Red Sea (Erythraean Sea) is a seawater inlet of the Indian Ocean, lying between Africa and Asia.

The connection to the ocean is in the south through the Bab el Mandeb strait and the Gulf of Aden.

To the north lie the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez (leading to the Suez Canal).

The sea is underlain by the Red Sea Rift which is part of the Great Rift Valley.

The six countries bordering the Red Sea are:

  • Saudi Arabia
  • Yemen
  • Egypt
  • Sudan
  • Eritrea
  • DjiboutiImportant Seas | Geography for UPSC CSE

The Ionian Sea

  • The Ionian Sea is an elongated bay of the Mediterranean Sea, south of the Adriatic Sea.
  • It is bounded by Southern Italy to the west, southern Albania to the north, and Greece's west coast.

Marginal Seas of the Arctic Ocean

  • Barents Sea
  • The Irish Sea

Marginal Seas of the Atlantic Ocean

  • Argentine Sea
  • Caribbean Sea
  • English Channel
  • Gulf of Mexico
  • Hudson Bay
  • Irish Sea
  • Labrador Sea
  • Mediterranean Sea
  • North Sea
  • Norwegian Sea
  • Scotia Sea

Marginal Seas of the Indian Ocean

  • Andaman Sea
  • Arabian Sea
  • Bay of Bengal
  • Java Sea
  • Persian Gulf
  • Red Sea
  • Sea of Zanj

Marginal Seas of the Mediterranean Sea

  • Adriatic Sea
  • Aegean Sea

Marginal Seas of the Pacific Ocean

  • Bering Sea
  • Celebes Sea
  • Coral Sea
  • East China Sea
  • Philippine Sea
  • Sea of Japan
  • Sea of Okhotsk
  • South China Sea (another important conflict zone)
  • Tasman Sea (between Australia and New Zealand)
  • Yellow Sea (by the Korean Peninsula)

Other Seas

  • The Caribbean Sea is sometimes defined as a marginal sea, sometimes as a Mediterranean sea.
  • The Caspian Sea is also sometimes defined as a marginal sea, and also the Dead Sea.
The document Important Seas | Geography for UPSC CSE is a part of the UPSC Course Geography for UPSC CSE.
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FAQs on Important Seas - Geography for UPSC CSE

1. What are the five most important seas in the world?
Ans. The five most important seas in the world are the Mediterranean Sea, the Red Sea, the Arabian Sea, the Caribbean Sea, and the South China Sea.
2. How does the Mediterranean Sea contribute to global trade?
Ans. The Mediterranean Sea is an important trade route connecting Europe, Africa, and Asia. It allows for the transportation of goods, such as oil, natural gas, and various commodities, facilitating global trade and economic activities.
3. What makes the Red Sea significant in terms of marine biodiversity?
Ans. The Red Sea is known for its high marine biodiversity. Its warm and nutrient-rich waters support a wide range of coral reefs, fish species, and other marine life. It is home to over 1,200 species of fish, including many endemic and endangered species.
4. How does the Arabian Sea impact the weather patterns of surrounding regions?
Ans. The Arabian Sea plays a crucial role in influencing the weather patterns of the neighboring regions. Its warm waters contribute to the formation of the Indian monsoon, which brings seasonal rainfall to the Indian subcontinent. The sea's temperature and evaporation also affect the intensity of cyclones and tropical storms in the region.
5. What are the major shipping routes passing through the South China Sea?
Ans. The South China Sea is a significant maritime route, with major shipping routes passing through it. These routes include the Strait of Malacca, which connects the Indian Ocean to the Pacific Ocean, and the Strait of Hormuz, which is a crucial oil transport route between the Persian Gulf and the Indian Ocean. Additionally, the sea is also important for trade between East Asian countries and the rest of the world.
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