I am known for my great length and depth, often appearing in maps as a blue line. What am I?

Category: Geography · Difficulty: expert

Hint: Consider bodies of water on maps.

Answer

A river basin

Explanation

A river basin refers to the land drained by a river, typically shown as blue on maps.

This is a expert geography riddle — one of the harder riddles here. The answer is A river basin.

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