With a drainage basin of 21,500 square kilometres (8,300 sq mi)[1] and an average discharge at 255 m3/s, the Tuloma is one of the biggest rivers in northern Fennoscandia.

The Lower Tuloma was finished in 1938, and is located at the town of Murmashi, close to the rivers outflow into the Kola Bay.

The dam raised the river by 19 metres (62 ft), and the resulting reservoir was 60 kilometres (37 mi) long.

When hydro power plants were built the salmon spawning grounds and migration routes were destroyed.

(tuulomajoki.fi) There is a project under way to ascertain whether it is possible to reestablish the salmon to the river, by allowing the fish to pass the dams and thus reaching spawning grounds in the tributaries above the reservoirs, which are still in their natural state.