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The tallest mountain in the world is Mt Everest, which stands at a height of 8,848.86 meters (29,031.7 feet) above sea level. This measurement makes it the highest point on Earth, located in the Himalayas on the border between Nepal and the Tibet Autonomous Region of China. Mt Everest has been the focus of numerous climbing expeditions since it was first summited in 1953, and its prominence has made it a symbol of both natural beauty and extreme adventure in mountaineering.

In contrast, the other mountains listed, such as K2, Kilimanjaro, and Denali, while extremely impressive in their own right, do not reach the same elevation as Mt Everest. K2 is the second tallest mountain, standing at 8,611 meters (28,251 feet), while Kilimanjaro and Denali also have significant heights but do not compare to Mt Everest's stature. Therefore, Mt Everest's status as the tallest mountain is well-established in both geographic and mountaineering contexts.