Jääsjärvi (; ) is a medium-sized

lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...

Finland Finland ( fi, Suomi ; sv, Finland ), officially the Republic of Finland (; ), is a Nordic country in Northern Europe. It shares land borders with Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of B ...

. It is located in the Hartola and

Joutsa Joutsa is a municipality of Finland. It is located in the province of Western Finland and is part of the Central Finland region. Jyväskylä is located about north of the Joutsa municipality. The municipality has a population of () and covers an ...

municipalities A municipality is usually a single administrative division having corporate status and powers of self-government or jurisdiction as granted by national and regional laws to which it is subordinate. The term ''municipality'' may also mean the go ...

, in the

Central Finland Central Finland ( fi, Keski-Suomi; sv, Mellersta Finland) is a Regions of Finland, region ( / ) in Finland. It borders the regions of Päijät-Häme, Pirkanmaa, South Ostrobothnia, Central Ostrobothnia, North Ostrobothnia, Northern Savonia, No ...

and Päijänne Tavastia regions. The water quality in the lake is excellent.Jääsjärvi
Järviwiki Web Service. Retrieved 2014-02-28. The

river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

Tainionvirta has its source in Jääsjärvi and flows through several smaller lakes to Päijänne. The water in Jääsjärvi is bright. The lake is part of the Sysmä catchment area and

Kymijoki The Kymi ( fi, Kymijoki, sv, Kymmene älv) is a river in Finland. It begins at Lake Päijänne, flows through the provinces of Päijänne Tavastia, Uusimaa and Kymenlaakso and discharges into the Gulf of Finland. The river passes the towns of H ...

main

catchment area In human geography, a catchment area is the area from which a location, such as a city, service or institution, attracts a population that uses its services and economic opportunities. Catchment areas may be defined based on from where people are ...

. There are dozens of

islands An island (or isle) is an isolated piece of habitat that is surrounded by a dramatically different habitat, such as water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island ...

in the lake. The biggest are Vehkasalo, Hirtesalo, Kotisalo, Ohrasaari, Urrionsaari, and Nautsalo. Vehkasalo, Hirtesalo, and Ohrasaari have roads connecting them to the mainland. In winter time, the lake typically freezes.

References

See also