Tonguo

The Tonguo (Тонгуо; Тоҥуо) is a river in Yakutia (Sakha Republic), Russia. It is a right hand tributary of the Vilyuy, with a length of 317 km and a drainage basin area of 6940 km2.

The river flows across uninhabited territory of Verkhnevilyuysky District. Its confluence with the Vilyuy lies approximately 30 km to the northwest of Verkhnevilyuysk.

Course
The Tonguo begins on the northern slopes of the Lena Plateau. It flows roughly in a northward and northwestward direction along most of its course. After it descends into the Central Yakutian Lowland it meanders strongly. In its last stretch the Tonguo bends to the NNE. Finally it joins the right bank of the Vilyuy 463 km from its mouth. The river freezes in mid October and stays under ice until the second half of May.

The largest tributaries of the Tonguo are the 76 km long Loglor (Логлор) from the right and the 94 km long Tonguochan (Тоҥуочаан) from the left.