Lac la Nonne is fairly large (11.8 km2) and deep (maximum depth 19.8 m) lake located about 90 km northwest of Edmonton in the counties of Barrhead and Lac Ste. Anne. This is a highly developed and popular recreational lake. The closest large population centre is the town of Barrhead, 20 km to the north. The name of the lake was originally mi-ka-sioo, meaning "eagle" in Cree. The current name, Lac la Nonne has an uncertain origin but is believed to derive from "the nun" in French. In 1827, Edward Ermatinger recorded the lake's name in his journal as Lac La Nane or “Lac La Nan“. It has been suggested that the name comes from the white-winged scoter, a duck with features similar to ducks in England known as "the nun".