Mount Gelai, also known as the Gelai Volcano, is a volcano in Tanzania’s Ngorongoro Crater Highlands that stands at 2,942 meters (9,652 feet) tall. It is located on the East African Rift on the southeastern side of Lake Natron in Ngorongoro District, Arusha Region. Gelai is the third most visible mountain in Arusha Region and the region’s 13th tallest peak. Gelai’s volcanic activity extends back fewer than a million years. In 2007, there were many earthquakes in the region. On the southern side of Gelai, a NNE-oriented fracture or narrow graben emerged as a result of the biggest earthquake on July 17. The crack might be linked to the intrusion of a thin dike at a depth of 4,000 meters (13,000 ft).