Sinyaya River
 The Sinyaya (Russian: Синяя Belarusian: Сінюха Latvian: Zilupe) is a river in Verkhnyadzvinsk Raion of Vitebsk Region of Belarus in Zilupe Ludza and Cibla municipalities of Latvia and in Sebezhsky Krasnogorodsky and Ostrovsky Districts of Pskov Oblast in Russia part of the Baltic Sea basin. It is a left tributary of the Velikaya River. It is 195 kilometres (121 mi) long and the area of its basin 2040 square kilometres (790 sq mi).