Medumi Lake’s (Medumu ezeraine) Nature Park area is 1375 ha. The highest points of Nature Park are: Medumu hill, Samanku hill, Skirstenu hill and Ziedinu hill. Among the glacial hills, there are several lakes in the hollows, the largest of which are Medumi lake, Ilga lake, Samankas lake, Skirstenu lake and others. Lakes along with mixed and broad-leaved forests and fields, forms a unique, magnificent natural landscape.
Islands of Medumu lake is a botanical reserve, which has been protected since 1987. The total area of the reserve (4 islands) is 4 hectares. Vegetation of islands are dominated by linden, aspen and birch