This body of water can be accessed through the city of Ulan-Ude, and the Barguzin Mountains and the Primorskiy Mountains surround this body of water. This body of water is home to many Buryat tribes, and its largest island is Olkhan. The Turka, Sarma, and Selenga Rivers drain into this body of water, and it is located in the Yenisei River basin via its outflow in the Angara River. Holding one fifth of the world's fresh water, it is the world's second most voluminous lake to the Caspian Sea. For the 10 points, the city of Irkutsk lies near what 
This body of water can be accessed through the city of Ulan-Ude, and the Barguzin Mountains and the Primorskiy Mountains surround this body of water. This body of water is home to many Buryat tribes, and its largest island is Olkhan. The Turka, Sarma, and Selenga Rivers drain into this body of water, and it is located in the Yenisei River basin via its outflow in the Angara River. Holding one fifth of the world's fresh water, it is the world's second most voluminous lake to the Caspian Sea. For the 10 points, the city of Irkutsk lies near what Russian lake, the oldest and deepest in the world?
This body of water can be accessed through the city of Ulan-Ude, and the Barguzin Mountains and the Primorskiy Mountains surround this body of water.
Lake Baikal [accept Ozero Baykal]