| Kasplya | |
| Source1 Coordinates: | 54.9833°N 69°W |
| Mouth: | Daugava (Western Dvina) |
| Mouth Coordinates: | 55.4086°N 30.7187°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia, Belarus |
| Length: | 136km (85miles) |
| Discharge1 Avg: | 36.9m3/s[1] |
| Basin Size: | 5410km2 |
The Kasplya (Belarusian and Russian: Каспля) is a river in Smolensky, Demidovsky, and Rudnyansky Districts of Smolensk Oblast of Russia and in Vitebsk Region of northern Belarus. It is a major left-bank tributary of the Daugava. Of its total length of 136km (85miles), the first 116km (72miles) are in Russia, and the rest in Belarus.[2] It joins the Daugava in the urban-type settlement of Surazh. The town of Demidov is situated on the Kasplya.
The source of the Kasplya is in Lake Kasplya in Smolensky District. It flows north, crosses the border with Demidovsky District and turns northwest. It flows through Demidov, and next to the selo of Boroda turns west, crosses Rudnyansky District and enters Belarus. There, it turns northwest again and enters the Daugava.
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 Dnieper near Gnezdovo.[3]