It is 872 kilometres (542 mi) long, and its drainage basin covers 238,000 square kilometres (92,000 sq mi).[1] Including its longest source river, the Sartang, it is 1,492 km (927 mi) long.[2] Its annual discharge totals approximately 35 cubic kilometres (28,000,000 acre⋅ft). Most of this discharge occurs in May and June as the ice on the river breaks up. The Yana freezes up on the surface in October and stays under the ice until late May or early June.