The Tumcha (Russian: Тумча, Finnish: Tuntsajoki) is a river in the south of the Kola Peninsula in Murmansk Oblast, Russia. It is 20 kilometers (12 mi) in length. The area of its basin is 5,240 square kilometers (2,020 sq mi). The river originates in the confluence of the rivers Kutsayoki and Tuntsayoki and flows into the Iova Reservoir which is drained by the Kovda.

The Tumcha River carries its waters in the very north of Karelia and in the Murmansk region, already beyond the Arctic Circle.

The harsh beauty of the northern taiga, a series of interesting rapids, an abundance of mushrooms and berries (according to the season) — all this is prepared by the river for its guests.