Opir (river)
The Opir River () is located in Ukraine, within Stryi Raion of Lviv Oblast. It is a right tributary of the river Stryi (Dniester basin). Geography 
The Opir River originates on the eastern slope of Velykyi Yavirnyk Mountain () in the , south of the village of . It runs between the mountains of the Skole Beskids, mainly to the northeast and north. It flows into the Stryi River between the town of Verkhnie Synovydne and the village of Mezhybrody. The Opir is  long, with a basin size of . Its average stream gradient is . The river flows in a V-shaped valley, with a width varying between  and  in the lower reaches. The floodplain is bilateral, sometimes unilateral, with a width ranging from  to . The shores are steep and occasionally swampy. The stream bed is rocky, with a width of  to , and a depth of  to . The bottom is usually lined with pebbles of Carpathian sandstones. The river supplies water for settlements and for the irrigation of agricultural lands. Recently, the river has become popular among tourists who go rafting. Tributaries 
Eight small rivers and 31 streams with a total length of  and an area of  flow into the river. Right: , , , , , , , , , , . Left: , , , , , , . Settlements 
Several settlements are located on the river (in order from the source to the mouth): , Lavochne, Ternavka, Slavske, Tukhlia, Hrebeniv, Skole, Dubyna, Verkhnie Synovydne. Gallery

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Rivers of Lviv Oblast
Tributaries of the Dniester