Oceans, Rivers & Lakes
1 / 15Dive into geography! Test your knowledge of the world's great bodies of water.
15 quick questionsNo sign-upFree to playTap an answer below to begin ↓
Which is the largest ocean on Earth?
About Oceans, Rivers & Lakes
Oceans, Rivers & Lakes is a free general knowledge quiz with 15 multiple-choice questions with a mix of 6 medium, 5 easy, 4 hard questions. Dive into geography! Test your knowledge of the world's great bodies of water. A typical run takes about 7 minutes, hints are always one tap away, and your streak ticks up the first time you finish a game on a given day.
A few sample questions
1. Which is the largest ocean on Earth?
Answer: Pacific Ocean
The Pacific Ocean covers about 63 million square miles — more than all the land on Earth combined. It was named by explorer Ferdinand Magellan, meaning 'peaceful sea.'
2. The Amazon River flows through which continent?
Answer: South America
The Amazon flows through South America, primarily Brazil and Peru. It carries more water than any other river — about 20% of all fresh water that flows into the world's oceans.
3. Which river is traditionally considered the longest in the world?
Answer: Nile
The Nile River stretches approximately 4,130 miles through northeastern Africa. It flows through 11 countries and was the lifeblood of ancient Egyptian civilization.
4. How many Great Lakes are there on the border of the United States and Canada?
Answer: 5
The five Great Lakes are Superior, Michigan, Huron, Erie, and Ontario. Together, they contain about 21% of the world's surface fresh water.
5. Why is the Dead Sea called 'dead'?
Answer: It has no fish or aquatic life
The Dead Sea is so salty (about 10 times saltier than the ocean) that almost no organisms can survive in it. Its high salt content also makes swimmers float effortlessly.
Things you'll learn along the way
- Lake Baikal is the deepest lake on Earth at over 5,300 feet deep. It contains about 20% of the world's unfrozen surface fresh water and is over 25 million years old.
- The Mississippi River flows south for about 2,340 miles and empties into the Gulf of Mexico near New Orleans. It drains water from 31 US states and two Canadian provinces.
- The Mediterranean Sea is bordered by three continents: Europe to the north, Africa to the south, and Asia to the east. Its name comes from Latin meaning 'middle of the Earth.'
Frequently asked questions
How many questions are in Oceans, Rivers & Lakes?
Oceans, Rivers & Lakes has 15 multiple-choice questions. Each one has four answer options and an explanation that appears after you answer, so you learn something even when you miss.
Is Oceans, Rivers & Lakes free to play?
Yes. The entire SeniorBrainGames catalog — including Oceans, Rivers & Lakes — is free, with no sign-up required, no time limits, and no ads on top of the game. It also works offline once the page has loaded once.
How long does Oceans, Rivers & Lakes take?
Most players finish Oceans, Rivers & Lakes in about 7 minutes. You can pause between questions, replay it as often as you like, and there is no penalty for taking your time — answers are explained after you submit them.
What's a good follow-up after Oceans, Rivers & Lakes?
If you enjoyed this general knowledge quiz, try the Daily Challenge — five rotating questions, refreshed every 24 hours, that count toward your streak. You can also use the Surprise Me button on the homepage to land on a different game type for variety.
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