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Deep-dive into the world's oceans, seas, currents and maritime geography — for true experts only!
1. The Strait of Malacca connects the Indian Ocean to which sea?
💡 The Strait of Malacca between Malaysia and Indonesia connects the Indian Ocean to the South China Sea — one of the world's most important shipping lanes.
2. The Banda Sea is located in which country's archipelago?
💡 The Banda Sea is located in eastern Indonesia — surrounded by the Maluku Islands (Spice Islands), it was historically important for the nutmeg and clove trade.
3. Which sea is completely surrounded by land with no direct ocean outlet?
💡 The Caspian Sea is the world's largest enclosed inland body of water — bordered by Russia, Kazakhstan, Turkmenistan, Iran, and Azerbaijan, with no ocean connection.
4. Which ocean has the most coral reefs?
💡 The Pacific Ocean contains the vast majority of the world's coral reefs — including the Great Barrier Reef (Australia) and the Coral Triangle (Southeast Asia).
5. The Labrador Current carries cold water from the Arctic along the coast of which country?
💡 The Labrador Current flows southward along the eastern coast of Canada from the Arctic — it famously contributed to the iceberg that sank the Titanic in 1912.
6. The Celebes Sea is bordered by the Philippines, Indonesia and which other country?
💡 The Celebes Sea (Sulawesi Sea) is bordered by the southern Philippines to the north, Indonesia's Sulawesi to the south, and Malaysia's Sabah (Borneo) to the west.
7. Which two continents are separated by the Davis Strait?
💡 The Davis Strait separates Greenland (Danish territory) from Baffin Island, Canada — a body of water connecting the Labrador Sea to Baffin Bay.
8. What is the name of the warm ocean current that flows along the east coast of Australia?
💡 The East Australian Current (EAC) flows southward along Australia's east coast — a warm ocean current made famous in the film Finding Nemo.
9. What percentage of Earth's surface is covered by oceans?
💡 Approximately 71% of Earth's surface is covered by oceans — with the Pacific alone covering more area than all of Earth's land combined.
10. The Drake Passage connects which two oceans?
💡 The Drake Passage between Cape Horn (South America) and the Antarctic Peninsula connects the Atlantic and Pacific Oceans — the roughest sea crossing in the world.
11. Which sea has the highest average salinity in the world among major seas?
💡 The Red Sea has an average salinity of about 40 parts per thousand — higher than the global ocean average of 35 ppt, due to high evaporation and limited freshwater input.
12. Which ocean is shrinking due to tectonic plate movement?
💡 The Pacific Ocean is shrinking at roughly 2.5 cm per year as the Pacific Plate subducts under surrounding plates — while the Atlantic Ocean is slowly expanding.
13. What is the name of the underwater mountain range that runs through the Atlantic Ocean?
💡 The Mid-Atlantic Ridge is a 16,000 km underwater mountain range running through the Atlantic — a divergent tectonic boundary where the plates are pulling apart.
14. Which sea lies between Saudi Arabia and the Horn of Africa?
💡 The Gulf of Aden lies between Yemen (Arabian Peninsula) and Somalia (Horn of Africa) — connecting the Red Sea to the Arabian Sea via the Bab-el-Mandeb strait.
15. The Mozambique Channel separates Madagascar from which country?
💡 The Mozambique Channel is a 1,600 km stretch of the Indian Ocean separating Madagascar from Mozambique on the African mainland.
16. The Kara Sea lies off the northern coast of which country?
💡 The Kara Sea is a marginal sea of the Arctic Ocean off the northern coast of Russia — bounded by Novaya Zemlya to the west and the Yamal Peninsula to the east.
17. Which ocean zone receives no sunlight at all?
💡 The abyssopelagic zone (4,000-6,000 metres) and hadal zone (below 6,000 metres) receive absolutely no sunlight — the hadal zone is found only in ocean trenches.
18. The Sargasso Sea is unique because it has no coastline. It is defined by what?
💡 The Sargasso Sea in the North Atlantic is the only sea without a land boundary — defined entirely by four surrounding ocean currents including the Gulf Stream.
19. Which ocean current is responsible for the cold, foggy climate of San Francisco?
💡 The California Current is a cold Pacific Ocean current flowing southward along the US west coast — it causes San Francisco's famous summer fog and cool temperatures.
20. What is the approximate depth of the average ocean floor?
💡 The average depth of the world's oceans is approximately 3,700 metres — with the Pacific being deepest at an average of about 4,000 metres.