Kallahti area is a beautiful recreation area and nature reserve in eastern Helsinki. There is also a very popular beach there. The ridge was born some 12000 years ago during the last Ice Age by heaping of the the ice sheet melting water. It is a section of similar ridges in southern Finland. Pine forest there is about 150 years old. The ridge continues to the southeast but lower and still another four kilometers on the seabed. The highest points of the offshore section appear as islands. The ridge is the third protected nature reserve in Helsinki and belongs to the national ridge protection program as only one in the city. Movement in the area is restricted to marked paths, because the ridge nature is easily damaged.