
1) European river 2) European watercourse 3) European waterway 4) Greek river 5) Greek watercourse 6) Greek waterway 7) River in Greece 8) River in Europe 9) Watercourse in Greece 10) Waterway in Greece 11) Watercourse in Europe 12) Waterway in Europe
Found on
https://www.crosswordclues.com/clue/treska

The Treska was a Russian Lin Class coastal defence submarine of 500 tons displacement launched in 1935. The Treska had a top speed of 19 knots surface; 9 knots submerged. She was armed with one 1 pdr anti-aircraft gun; four 21 inch torpedo tubes.
Found on
http://www.probertencyclopaedia.com/browse/RT.HTM
No exact match found.