| Ulakhan-Vava | |
| Other Name: | Улахан-Вава |
| Pushpin Map: | Russia Sakha Republic |
| Pushpin Map Caption: | Mouth location in Yakutia, Russia |
| Source1 Coordinates: | 65.0311°N 106.0953°W |
| Mouth Coordinates: | 65.0442°N 109.2233°W |
| Subdivision Type1: | Federal Subject |
| Length: | 374km (232miles) |
| Discharge1 Avg: | 62m3/s |
| Basin Size: | 12500km2 |
The Ulakhan-Vava (Russian: Улахан-Вава; Yakut: Улахан-Вава) is a river in Yakutia (Sakha Republic), Russia. It is a left hand tributary of the Vilyuy, and is 374km (232miles) long, with a drainage basin of 12500km2.
The river flows across Mirninsky District; there are no permanent settlements in the area. The nearest inhabited place is Ekonda, located about 80km (50miles) to the NNW of the river source.[1]
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 2043km (1,269miles) from its mouth in the Lena. The confluence is almost opposite the mouth of the Sen in the facing bank.[2] [3] [4]
The main tributaries of the Ulakhan-Vava are the 101km (63miles) long Khaim (Хайм), the 105km (65miles) long Sengachanda, the 72km (45miles) long Mayykta-Seene (Майыкта-Сээнэ) and the 194km (121miles) long Kyuryungnekan (Кюрюнгнэкээн) from the right; and the 83km (52miles) long Umotka and the 46km (29miles) long Vava from the left. The river is fed by snow and rain. It freezes in October and stays under ice until early June.[5]
