Mauna Kea is the tallest mountain on Earth, around 33,500 ft / 10,210 m, but most of it is underwater. The part above sea level is 13,803 ft / 4,207 m. Mount Everest is the tallest above sea level, and the border between Nepal and China runs directly over its summit. Here are the tallest mountains, measured in feet and meters:

1. Mount Everest, Nepal/China: 29,032 ft (8,848.86 m)
2. K2, Pakistan/China: 28,251 ft (8,611 m)
3. Kangchenjunga, Nepal/India: 28,169 ft (8,586 m)
4. Lhotse, Nepal/China: 27,940 ft (8,516 m)
5. Makalu, Nepal/China: 27,838 ft (8,485 m)
6. Cho Oyu, Nepal/China: 26,864 ft (8,188 m)
7. Dhaulagiri I, Nepal: 26,795 ft (8,167 m)
8. Manaslu, Nepal: 26,781 ft (8,163 m)
9. Nanga Parbat, Pakistan: 26,660 ft (8,126 m)
10. Annapurna I, Nepal: 26,545 ft (8,091 m)