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Mauna Kea is a dormant volcano on the island of Hawaii. Its peak is 4,207.3 m (13,803 ft) above sea level, making it the highest point in the state of Hawaii and second-highest peak of an island on Earth. The peak is about 38 m (125 ft) higher than Mauna Loa, its more massive neighbor. Mauna Kea is unusually topographically prominent for its height: its wet prominence is fifteenth in the world among mountains, at 4 m (13 ft); its dry prominence of 9,330 m (30,610 ft) is second in the world, only after Mount Everest. This dry prominence is taller than Mount Everest's height above sea level of 8,848.86 m (29,032 ft), and some authorities have labelled Mauna Kea the tallest mountain in the world, from its underwater base.[a]

It is about one million years old and thus passed the most active shield stage of life hundreds of thousands of years ago. In its current post-shield state, its lava is more viscous, resulting in a steeper profile. Late volcanism has also given it a much rougher appearance than its neighboring volcanoes due to construction of cinder cones, decentralization of its rift zones, glaciation on its peak, and weathering by the prevailing trade winds. Mauna Kea last erupted 6,000 to 4,000 years ago and is now considered dormant.

is Earth's highest mountain above sea level, located in the Mahalangur Himal sub-range of the Himalayas. The China–Nepal border runs across its summit point. Its elevation (snow height) of 8,848.86 m (29,031.7 ft) was most recently established in 2020 by the Chinese and Nepali authorities.

Mount Everest attracts many climbers, including highly experienced mountaineers. There are two main climbing routes, one approaching the summit from the southeast in Nepal (known as the "standard route") and the other from the north in Tibet. While not posing substantial technical climbing challenges on the standard route, Everest presents dangers such as altitude sickness, weather, and wind, as well as hazards from avalanches and the Khumbu Icefall. As of 2019, over 300 people have died on Everest, many of whose bodies remain on the mountain.

The Tibetan name for Everest is Qomolangma ("Holy Mother"). The name was first recorded with a Chinese transcription on the 1721 Kangxi Atlas during the reign of Emperor Kangxi of Qing China, and then appeared as Tchoumour Lancma on a 1733 map published in Paris by the French geographer D'Anville based on the former map. It is also popularly romanised as Chomolungma and (in Wylie) as Jo-mo-glang-ma.