The Finnish lake containing the deepest point of any lake in Finland is Päijänne.
Päijänne reaches 95.3 metres at its deepest point, making it Finland’s deepest lake. It stretches for about 120 kilometres through central Finland and drains southward through the Kymi River toward the Gulf of Finland.
Päijänne is Finland’s second-largest lake by surface area, after Saimaa, and contains roughly 1,886 islands. Its varied shape reflects glacial erosion, which carved deep basins and left rocky islands across the lake district.
A common mix-up is to name Saimaa because it is Finland’s largest lake. Päijänne is also important beyond geography: the Päijänne Water Tunnel supplies water to the Helsinki metropolitan area.