Ostrovsky District
The source of the Rītupe is Lake Meirānu in the lake district south of the town of Kārsava. The river flows north, passes from the center of Karsava, at a short stretch makes the state border between Latvia and Russia, and crosses into the Russian territory, to Pytalovsky District of Pskov Oblast. The official name of the river in Russia is the Utroya. The river further flows northwest, passes the town of Pytalovo, crosses into Ostrovsky District, accepts the Lzha from the right, and turns north. The mouth of the Utroya is in the village of Larino.