Nordmarka is the mostly forested region which makes up the northern part of Oslo, Norway. The area called "Nordmarka" also extends into the municipalities of Hole, Ringerike, Lunner, Jevnaker and Nittedal. It is the largest part of the Marka borough. There are several lakes in Nordmarka, which are used as a supply for drinking water, largest of these is the Maridalsvannet. Svarttjernshøgda in Jevnaker is the highest point in Nordmarka, at a height of 717 m.