`Mustjärv` (Black lake) is located 0,5 km to the south of the `Valgejärv` (White Lake) and is larger and a complete opposite to its neighbour. The banks of this forest lake are low, boggy and, especially in the south, difficult to move along. Its waters are acidic, reddish-brown, extremely opaque (transparency is only 0,4 m), and rich in organic elements. Hikers can rest on the banks near a fire or make a picnic in a specially equipped roofed place.