Slocan Lake is a lake in the Slocan Valley of the West Kootenay region of the Southeastern Interior of British Columbia, Canada. it is drained by the Slocan River, which flows south from the lake's foot at Slocan City through the Slocan Valley to South Slocan, British Columbia, where that river meets the Kootenay River a few miles above its confluence with the Columbia. It is fed by Bonanza Creek, which comes down the pass from Summit Lake, beyond which is the town of Nakusp on Upper Arrow Lake.