Lac Île-à-la-Crosse is a lake in North-Central Saskatchewan, Canada on the Churchill River. It is basically Y-shaped. At the center of the Y is the town of Île-à-la-Crosse, the second oldest town in Saskatchewan. The Churchill exits the northeast arm and flows east to Hudson Bay through a series of lakes. The Churchill enters at the northwest arm called Aubichon Arm or Deep River. Upstream it leads northwest to Athabasca Country passing Churchill Lake, Peter Pond Lake, Lac La Loche and on to the Methye Portage leading to Lake Athabasca.