Which mountain range contains Mount Everest?

Mount Everest is part of the Himalayas.

Everest lies in the Mahalangur Himal sub-range of the Himalayas, on the border between Nepal and China's Tibet Autonomous Region. Its jointly recognised elevation is 8,848.86 metres above sea level, making it Earth's highest mountain by that standard.

The Himalayas formed as the Indian tectonic plate collided with the Eurasian plate. That continuing collision pushed ancient rocks upward and still raises the region very slowly. The range stretches across or along five countries: Bhutan, China, India, Nepal, and Pakistan, although Everest itself is shared by Nepal and China.

Everest is often confused with the nearby Karakoram, which is a separate mountain system containing K2. The mountain is known as Sagarmatha in Nepal and Qomolangma in Tibet. Edmund Hillary and Tenzing Norgay made the first officially recognised ascent on 29 May 1953, using the southeast route from Nepal.