The river begins at Selassie Lake at an elevation of 334 metres (1,096 ft).

From Selassie Lake, the river flows southwest and then south to where the right tributary Blackett Creek joins at an elevation of 313 metres (1,027 ft).

It continues south and enters Whitesand Lake at an elevation of 311 metres (1,020 ft).

Here the Canadian National Railway transcontinental line crosses the river at the south end of the lake at a point just east of Armstrong Airport and about 11.5 kilometres (7.1 mi) east of the community of Armstrong, Thunder Bay District, Ontario.

This article related to a river in Northern Ontario, Canada is a stub.