Bolshaya Ercha

The Bolshaya Ercha is a river in the Sakha Republic, Russia. It is a tributary of the Indigirka. The river has a length of and a drainage basin area of.
The river flows north of the Arctic Circle, across desolate territories of the Allaikhovsky District.

Course

The Bolshaya Ercha is a right tributary of the Indigirka. It has its sources in the northern slopes of the Ulakhan-Sis range. The river flows first northwestwards in its uppermost section, and then in a roughly western / WSW direction skirting the Kondakov Plateau which rises to the north. In its last stretch the river descends into the Indigirka floodplain among numerous lakes where it meanders strongly, forming oxbow lakes. Finally the Bolshaya Ercha joins the Indigirka from its mouth. Now uninhabited Vorontsovo, [Sakha Republic|Vorontsovo] village lies near the confluence, on the facing bank of the Indigirka.

Tributaries

The main tributary of the Bolshaya Ercha is the long Malaya Ercha on the right, as well as the long Kusagan-Yurekh, the long At-Khaya, the long Kistike and the long Erkichan on the left. The river is frozen between the beginning of October and the beginning of June. There are more than 600 lakes in its basin.