Kostonjärvi

{{Short description|Lake in the Northern Ostrobothnia region of Finland}}

{{Infobox lake

| name = Kostonjärvi

| image =

| alt =

| caption =

| image_bathymetry =

| alt_bathymetry =

| caption_bathymetry =

|pushpin_map=Finland

| location = Taivalkoski

| coords = {{coord|65|47|N|28|27|E|region:FI_type:waterbody_source:GNS-enwiki}}

| type =

| inflow = Kynsijoki river

| outflow = Kostonjoki river

| catchment = Iijoki

| basin_countries = Finland

| length =

| width =

| area = {{convert|43.69|km2|abbr=on}}

| depth = {{convert|5.09|m|abbr=on}}

| max-depth = {{convert|17|m|abbr=on}}

| volume = {{convert|0.222|km3|acre.ft|abbr=on}}

| residence_time =

| shore = {{convert|71.1|km|abbr=on}}

| elevation = {{convert|231.6|m|abbr=on}}

| frozen = November–May

| islands =

| cities =

| reference =

}}

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.[http://www.jarviwiki.fi/w/index.php?title=Kostonj%C3%A4rvi_%2861.622.1.001%29&setlang=en Kostonjärvi in Järviwiki Web Service]. Finnish Environment Institute. Retrieved 2014-03-22. {{in lang|en}} The surface elevation on the lake varies almost 5 meter due to the power production.[http://wwwi2.ymparisto.fi/i2/61/l616221001y/wqen.html Hydrological forecasts: Iijoki watershed - Kostonjärvi]. Finnish Environment Administration. Retrieved 2014-03-22. {{in lang|en}}