Jääsjärvi

Jääsjärvi is a large lake in Finland. It covers . It has many islands. The largest ones are Vehkasalo, Hirtesalo, Kotisalo, Ohrasaari, Urrionsaari and Nautsalo.
Municipalities near Jääsjärvi are Joutsa and Hartola. Jääsjärvi flows from the southwestern part via Tainionvirta and into several smaller lakes to Päijänne.