The Vaajanvirta, also spelled as Vaajavirta, is a 3.9-kilometre (2.4 mi) long[1] river in the Vaajakoski area of Jyväskylä, Finland.

[4] Vaajanvirta begins from the western part of lake Leppävesi with a surface at 80.8 metres (265 ft) above sea level.

Aside from Leppävesi, Vaajanvirta also gets water from Hupelinlampi, a small lake near Kanavuori, whose outlet discharges into the Saltunlahti bay of the river.

Haapakoski and Naiskoski are parallel rapids, respectively located on the western and eastern side of Naissaari, both of which are dammed.

[3] Vaajanvirta has a large basin covering an area of 17,668 square kilometres (6,822 sq mi), of which 16.8% is water.

[4] The Vaajanvirta is an important fishing site that is visited by multiple hundreds of fishers yearly.

The new plant was owned by SOK until 1984, when it was acquired by its current owner, Suur-Savon Sähkö Oy.