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.

Vaajanvirta discharges into the Päijänne, whose surface is located 78.3 metres (257 ft) above sea level.

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.