I run beneath the surface, connecting lands far and wide, I transport goods without a single sight. What am I?

Category: Geography · Difficulty: hard

Hint: Consider transportation systems that operate beneath us.

Answer

An underground railway system

Explanation

An underground railway system connects cities and regions covertly, providing essential transit options.

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

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