The Rainy River is a short river that enters the Thornbrough Channel at Port Mellon, British Columbia, Canada.

While it does come close to doing so, it never enters Tetrahedron Provincial Park.

[3] The Rainy River originates in a small unnamed lake just north of Tetrahedron Peak.

The river flows southeast for about 3.6 km before turning south and flowing that way for about 9.8 km to its mouth at Port Mellon.

This article about a river in the Coast of British Columbia, Canada is a stub.