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'Kasplya' is a river in Russia and Belarus, a left tributary of Daugava. Its length is 224 km, the first 157 km in Russia (Smolensk Oblast), and the rest in Belarus (Vitebsk Voblast). It starts from Lake Kasplya at , and joins the Daugava in the town of Surazh. The town of Demidov is situated on Kasplya. During the Viking Age, the river was an important part of the Dnieper trade route, as there was a portage from the Kasplya to the Dnieper tributaries entering the great river near Gnezdovo.