The Shelon (Russian: Шелонь) is a river in the northwest part of European Russia, in Dedovichsky, Porkhovsky, and Dnovsky Districts of Pskov Oblast and Soletsky and Shimsky Districts of Novgorod Oblast. The Shelon is one of the principal tributaries of Lake Ilmen. It has a length of 248 kilometres (154 mi) and drains a basin of 9,710 square kilometres (3,750 sq mi). The towns of Porkhov and Soltsy, as well as urban-type settlements of Dedovichi and Shimsk, are located on the banks of the Shelon River.