Volcanism is generally associated with the rift. Hot springs are present both on land and under Lake Baikal, although thus far, no evidence of actual volcanism has been found in the immediate vicinity of the lake. Despite this, Cenozoic volcanism has occurred nearby and is probably associated with the Baikal Rift Zone. Early volcanism has been confirmed to exist from the early Miocene, although it is believed that Oligocene Volcanism exists. The recognized volcanic centers are the Udokan Plateau, located about 400 km ENE of the northern tip of Lake Baikal, the Oka Plateau, located about 200 km WNW of the southwest tip of Lake Baikal, the Vitim Plateau, around 200 km east of the rift, and the Azas Plateau.