Ulakhan-Vava

The Ulakhan-Vava (Улахан-Вава; Улахан-Вава) is a river in Yakutia (Sakha Republic), Russia. It is a left hand tributary of the Vilyuy, and is 374 km long, with a drainage basin of 12500 km2.

The river flows across Mirninsky District; there are no permanent settlements in the area. The nearest inhabited place is Ekonda, located about 80 km to the NNW of the river source.

Course
The Ulakhan-Vava belongs to the upper section of the Vilyuy basin. Its sources are in an elevated part of the Vilyuy Plateau, near the Krasnoyarsk Krai border. It heads roughly southeastwards in its upper course and bends to the northeast in its middle reaches and heads roughly eastwards meandering in the floodplain. Finally, shortly before its mouth it bends sharply northeastwards and meets the right bank of the Vilyuy 2043 km from its mouth in the Lena. The confluence is almost opposite the mouth of the Sen in the facing bank.

The main tributaries of the Ulakhan-Vava are the 101 km long Khaim (Хайм), the 105 km long Sengachanda, the 72 km long Mayykta-Seene (Майыкта-Сээнэ) and the 194 km long Kyuryungnekan (Кюрюнгнэкээн) from the right; and the 83 km long Umotka and the 46 km long Vava from the left. The river is fed by snow and rain. It freezes in October and stays under ice until early June.