I stretch beneath borders, carrying movement silently. Above, cities thrive unaware; below, I link lives through tunnels deep. What am I?

Category: Geography · Difficulty: hard

Hint: Focus on subterranean manmade connections crossing countries.

Answer

An international underground tunnel

Explanation

International tunnels such as Channel Tunnel link different countries beneath land or sea, facilitating transport without surface visibility.

This is a hard geography riddle — a tricky one that takes a little thought. The answer is An international underground tunnel.

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