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Lake Sennitsa () is a sweetwater lake in Nevelsky District of Pskov Oblast, Russia adjacent to the Belarus–Russia border. It is the source of the Sennitsa River, a left tributary of the Lovat River in the drainage basin of the Neva. The village of Dubokray is located at the lakeside. The southern coast of the lake makes the border between Russia and Belarus. The eastern coast makes the border between Nevelsky and Usvyatsky Districts.