It is a tributary of the Clearwater River, which in turn flows into the Queets River.

The Solleks River is 10.7 miles (17.2 km) long.

[4] Its drainage basin is 15.9 square miles (41 km2) in area.

[5] The Solleks River originates in the Olympic Mountains on the Olympic Peninsula, about 5 miles (8.0 km) northeast of the mountain known as Kloochman Rock.

It flows west to join the Clearwater River near Upper Clearwater Campground.