Gołdapa river - The river is a right tributary of Węgorapa with a length of 89 km and catchment area of 678.40 km2. The source of Gołdapa is located near Szerejki village. Major part of river flows through Brożajcki canal. Larger tributaries include Dzięgiela , Pogorzelska Struga, Czarna Struga, Rożynka i Kanał Janki.
Węgorapa river - Its total length is 139.90 km, of which 43.90 km flows within polish land. Its outflow is in Mamry lake. Just behind Mieduniszkami river crosses the state border and gets to Russia.