Central Siberian Plateau
The Baikal Mountains are the origin of the Lena River. The Central Siberian Plateau is bounded on the south by the Eastern Sayan Mountains and the Baikal Mountains. The mountains around Lake Baikal are densely wooded with grey alder, Eurasian aspen, downy birch, Siberian larch, Siberian fir, Scots pine, and Siberian spruce.