The longest cave system in the world is Mammoth Cave in Kentucky.
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The border between Belgium and the Netherlands runs through a bar in the town of Baarle-Hertog.
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The Sahara Desert is one of the largest deserts in the world.
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Antarctica is the windiest continent — wind speeds can exceed 200 mph.
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The Andes mountains were formed by tectonic activity.
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The country of San Marino claims to be the world's oldest republic, founded in 301 AD.
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The Andes are one of the longest mountain ranges in the world.
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The highest navigable lake in the world is Lake Titicaca, shared between Peru and Bolivia at 12,507 feet.
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The Arctic experiences months of continuous daylight in summer.
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