The Bolshaya Ercha (Russian: Большая Эрча) is a river in the Sakha Republic (Yakutia), Russia.

[1] The river flows north of the Arctic Circle, across desolate territories of the Allaikhovsky District.

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.

Finally the Bolshaya Ercha joins the Indigirka 354 km (220 mi) from its mouth.

Now uninhabited Vorontsovo village lies near the confluence, on the facing bank of the Indigirka.