The Wiesensee (German pronunciation: [ˈviːzənzeː]) is an artificial lake, dammed up in 1971, in the Westerwald low mountain range. The lake covers about 80 hectares and lies in the area of Stahlhofen am Wiesensee's various centres on the lake's west shore, and Pottum on the north shore in the Westerwaldkreis. The community of Winnen borders on the lake to the southeast.