I am a boundary that divides yet unites, drawn by man but often ignored by sights. What am I, that you cross with ease, yet seldom know of my presence, if you please?

Category: Geography · Difficulty: expert

Hint: Consider a line that changes time rather than location.

Answer

International Boundary Line

Explanation

The International Date Line separates calendar days, affecting time but not physical geography.

This is a expert geography riddle — one of the harder riddles here. The answer is International Boundary Line.

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