Janakkala is a municipality of Finland. Its administrative centre is in Turenki, which is often erroneously shown on maps as being "Janakkala".It is located in the province of Southern Finland and is part of the Tavastia Proper region. To the south, Janakkala shares a boundary with Riihimäki, the Northern neighbour being Hämeenlinna. The municipality has a population of 16,896 (30 June 2015) and covers an area of 586.07 square kilometres (226.28 sq mi) of which 38.63 km2 (14.92 sq mi) is water.