Syvyydenkaivo

As the esker was deposited, ice blocks were buried in the sand. As they melted due to climate warming, kettle holes were formed. Together, the esker and the kettle holes form a kame terrain, which is typical of the Manamansalo and Rokuanvaara Hill landscape, for example. The highest esker mound of Rokuanvaara Hill, the Pookivaara Hill, is bordered by several kettle holes. One of them, Syvyydenkaivo, is the deepest natural kettle hole in Finland. The slopes of the kettle holes offer a variety of habitats for several species.