According to historical records, the ancestors of the Deer Ewenki people lived in the tundra highlands in the upper reaches of the Nercha River in the northeastern part of Lake Baikal in 2000 BC. By the 18th century, this branch of the Deer Ewenki people migrated along the Shilka River to the Greater Khingan Mountains on the right bank of the Ergun River. The Greater Khingan Mountains is located in the northeastern part of the Inner Mongolia autonomous region. The winter here is long and cold with the lowest temperature reaches minus 50 C.