Päijänne — Finland's second-largest lake

Location and neighbours

The lake lies between the regions of Central Finland and Päijänne Tavastia, and its waters ultimately run out to the sea via the outflow river network and the Kymijoki, reaching the Gulf of Finland. Local conditions change along its length: for example, water clarity and quality are reported to improve south of Jämsä.

Physical characteristics

Päijänne is long and narrow in parts and contains a large archipelago of islands, rocky shoals and bays. Certain basins reach substantial depth and the shoreline alternates between rugged rock and forested banks. These features create diverse habitats and attractive routes for boating and canoeing.

Human use and protection

The lake is used for recreation, fisheries and as a source of drinking water. A major engineering installation, the Päijänne Water Tunnel, conveys treated lake water to the Helsinki region and nearby communities, making the lake strategically important for urban supply. Parts of the lake and its islands are protected within national and regional conservation efforts and in areas designated for outdoor recreation.

Municipalities and access

Päijänne touches many municipalities on both shores. On the Central Finland side are Kuhmoinen, Jämsä, Joutsa, Luhanka, Muurame, Toivakka and Jyväskylä. On the Päijänne Tavastia side are Padasjoki, Asikkala and Sysmä. These towns provide access, services and opportunities for tourism and waterborne activities.

Ecology and notable facts

The lake supports a variety of freshwater fish and aquatic plants and is a destination for anglers and nature visitors. Protected areas, including island groups and shorelines, conserve breeding sites and scenic landscapes. Päijänne is widely recognised for its clear water, substantial archipelago, and role in supplying drinking water to southern Finland.