Kolkku

Kolkku is a lake located in Pihtipudas and Viitasaari in central Finland.

== Information == The surface area of the lake is 900 hectares, or 9 square kilometers. It is 9.4 kilometers long and 2.5 kilometers wide. The lake's Coast is clear and has an open lake, but it also has a couple of headlands. Kukasniemi is located at the northwest end and Peltoniemi in the middle. At the southeast end of the lake, the lake narrows to the end of the bay. Only two hills rise from the shores. On the eastern shore of the northern end of the lake you can see Mount Huhmavuori, which rises to a height of 35 meters, and on the western shore Kolkunmäki is just as high.