Mount Everest

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Mount Everest is the world's tallest mountain at 8,848 m (29,029 ft). It straddles the border of China / Tibet and Nepal and can be visited from either side:

Everest Base Camp Trek through Khumbu (Sagarmatha National Park), the more commonly visited region on the Nepalese (southern) side of the mountain
Qomolangma, the less visited nature reserve on the Tibetan (northern) side