Tumcha River (Russian: Тумча) 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 merger Kutsayoki River and Tuntsayoki River and flows into the Iova Reservoir which in turn is part of the Kovda River basin.