| Riou Lake | |
| Location: | Northern Saskatchewan Administration District |
| Coords: | 59.1066°N -106.267°W |
| Type: | Glacial lake |
| Inflow: | Riou River |
| Outflow: | Riou River |
| Cities: | None |
| Pushpin Map: | Saskatchewan#Canada |
| Pushpin Map Caption: | Location in Saskatchewan |
Riou Lake,[1] at [2] in size, is a large glacial lake along the course of Riou River[3] in the far northern part of the Canadian province of Saskatchewan. The lake is south of Lake Athabasca in the Northern Saskatchewan Administration District. Stony Rapids, a "two-hour ATV ride"[4] to the east, is the closest community. There are no settlements along the lake's shoreline, only a remote fishing camp called Riou Lake Outpost.[5]
Riou Lake's main inflow, the Riou River, begins south of the lake at Luffman Lake and flows into the southern shore. The Riou River exits Riou Lake at the western end and flows west into Engler and Richards Lakes. Otherside River flows from Richards Lake's northern shore into Lake Athabasca. Lake Athabasca is within the Mackenzie River drainage basin.[6] [7]
Fish commonly found in Riou Lake include burbot, cisco, lake trout, lake whitefish, longnose sucker, northern pike, round whitefish, walleye, and white sucker.[8] [9]