The Tuntsayoki (Russian: Тунтсайоки, Finnish: Tuntsajoki) is a river in the south of the Kola Peninsula in Murmansk Oblast, Russia. It is 150 kilometres (93 mi) long. The Tuntsayoki originates in the forests of Finland and flows into the river Tumcha. Its biggest tributary is the Vatsimanyoki.

Tuntsayoki
Finnish: Tuntsajoki
Native nameТунтсайоки (Russian)
Location
Countries
OblastMurmansk
RegionLapland
Physical characteristics
Mouth 
 • location
Tumcha
 • coordinates
66°44′12″N 30°29′23″E / 66.7368°N 30.4896°E / 66.7368; 30.4896
Length150 km (93 mi)
Basin features
ProgressionTumchaIova ReservoirKovdaWhite Sea
Tributaries 
 • leftVatsimanyoki