I separate nations, yet I am fluid; I can be calm or tumultuous, holding secrets within. What am I?

Category: Geography · Difficulty: hard

Hint: Consider a waterway that delineates territory.

Answer

A border river

Explanation

A border river is a river that serves as a boundary between different countries or regions.

This is a hard geography riddle — a tricky one that takes a little thought. The answer is A border river.

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