The northeast tip of the lake is 2 kilometres (1.2 mi) southwest of the Canadian National Railway mainline, 15 kilometres (9 mi) south of Ontario Highway 11 and 17 kilometres (11 mi) west of the community of Caramat.

The primary inflows are (counterclockwise from the Pic River outflow): the Pout River at the southeast; an unnamed creek from Little McKay Lake at Yankee Bay at the north; and Sandlink Creek at Northeast Bay at the northeast.

The primary outflow is the Pic River at Outlet Bay at the southeast tip of the lake, controlled by the McKay Lake Dam.

[1] Big Island in the centre of the lake is surrounded by the North, Morrin, South and West Channels.

This Northern Ontario geographical article is a stub.