Kostonjärvi is a medium-sized lake in the Iijoki main catchment area. It is located in Taivalkoski municipality, in the Northern Ostrobothnia region in Finland.Kostonjärvi in Järviwiki Web Service. Finnish Environment Institute. Retrieved 2014-03-22. The surface elevation on the lake varies almost 5 meter due to the power production.Hydrological forecasts: Iijoki watershed - Kostonjärvi . Finnish Environment Administration. Retrieved 2014-03-22.
See also List of lakes in Finland
References