Lake Viljandi (Estonian: Viljandi järv) is a lake in Viljandi County, Estonia. The lake lies in a deep valley below the town of Viljandi. It has a depth of 11 m (36 ft), length of 4.6 km (2.9 mi), width of 400 m (1,300 ft), and area of 1.55 km² (0.60 sq mi).^[1] Uueveski and Valuoja creeks and a number of springs flow into the lake. The Raudna River flows from the southwestern part of the lake. The main fish in the lake are bream, roach, perch, and pike. The lake and its shores make up the Viljandi landscape protection area.

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Lake Viljandi
View from the ruins of Viljandi Castle
Lake Viljandi
Location	Viljandi County
Coordinates	58°21′0″N 25°35′35″E
Primary inflows	Valuoja, Uueveski Creek
Primary outflows	Raudna
Basin countries	Estonia
Max. length	4.33 km (2.69 mi)
Max. width	435 m (1,427 ft)
Surface area	1.58 km2 (0.61 sq mi)
Max. depth	11 m (36 ft)
Surface elevation	42.35 m (138.9 ft)
Settlements	Viljandi

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The Grand Race around Lake Viljandi is held annually.