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Päijänne(pă`ēyăn`nā), lake c.560 sq mi (1,450 sq km), S central Finland, stretching c.85 mi (130 km) from Lahti, the chief port, N to Jyväskylä. One of the largest lakes of the Finnish plateau, it consists of several long rocky basins dotted with numerous islands. The Kymijoki drains it into the Gulf of Finland. Lake steamers and lumber rafts utilize the waterway.
a lake in southern Finland. Measuring approximately 140 km long and up to 28 km wide, Lake Päijänne has an area of 1,065 sq km and depths to 93 m. It is located in a basin of ancient glacial origin. Its shores are mostly high and extremely ragged. Numerous islands dot the lake, which empties into the Gulf of Finland by way of the Kymi (Kymmene) River. Lake Päijänne is frozen from December through April. It is navigable, and there is fishing. The cities of Lahti and Jyväskylä are on Lake Päijänne.