On the Russian side of the Kaltonjoki (Santajoki) River, sea trout reproduces naturally. Baltic Whitefish rises regularly to the lower parts of the Vaalimaanjoki River, and trout also appear occasionally. Lake Peipsi/Chudskoe27 and the Narva Reservoir (built from 1955 to 1956) in the basin are transboundary, shared by Estonia and the Russian Federation.