a river in Pskov and Novgorod oblasts, RSFSR. The Shelon’ measures 248 km in length and drains an area of 9,710 sq km. It flows over the Il’men’ lowland and empties into Lake II’men’. It is fed predominantly by snow. High water is from April through May, and there is flash flooding in autumn. The mean flow rate 59 km from the mouth is 43.6 cu m per sec. The Shelon’ freezes in November or December, sometimes as late as March (1925), and the ice breaks up in March or April. It is navigable in the lower course. The cities of Porkhov and Sol’tsy are situated on the river.