
1) Balkan boundary river 2) European waterway 3) European watercourse 4) European river 5) International river of Europe 6) Long European waterway 7) Long waterway 8) Long watercourse 9) Long river 10) Long European river 11) Long European watercourse 12) Major river in Europe 13) Major European waterway
Found on
https://www.crosswordclues.com/clue/prut

River in eastern Europe; length 900 km/565 mi. The Prut rises in the Carpathian Mountains in southwestern Ukraine, and flows south to meet the Danube at Reni. For most of its course it forms the frontier between Romania and Moldova
Found on
https://www.encyclo.co.uk/local/21221

a river in E Europe, flowing SE from the Carpathian Mountains in Ukraine along the boundary between Moldavia (Moldova) and Rumania into the Danube. 500 mi. (800 km) long. German,(pr&oomacr;t).
Found on
https://www.infoplease.com/dictionary/prut
No exact match found.