Islands, Seas & Oceans Quiz
Oceans, seas, straits and the world’s most famous islands and archipelagos.
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About the Islands, Seas & Oceans Quiz
Oceans cover about 71 percent of Earth’s surface. This quiz dives into the five oceans, the seas and straits that connect them, and islands from Greenland to Madagascar.
This quiz has 20 questions, served in rounds of 10 with a fresh mix and shuffled answers every time you play. Every answer comes with a short explanation.
Sample Islands, Seas & Oceans Questions & Answers
Q1. What is the largest ocean on Earth?
✅ Answer: Pacific
💡 The Pacific covers about a third of Earth’s surface, more than all the land combined.
Q2. What is the largest island in the world that is not a continent?
✅ Answer: Greenland
💡 Greenland, an autonomous territory of Denmark, covers about 2.1 million square kilometres.
Q3. What is the deepest known point in the ocean?
✅ Answer: Challenger Deep
💡 Challenger Deep in the Mariana Trench is nearly 11,000 metres below the surface.
Q4. Which narrow strait separates Spain from Morocco?
✅ Answer: Strait of Gibraltar
💡 At its narrowest, the Strait of Gibraltar is about 14 km wide.
Q5. Madagascar lies off the coast of which continent?
✅ Answer: Africa
💡 Madagascar sits in the Indian Ocean off southeast Africa, and most of its wildlife exists nowhere else.