Fluvius Syriae, prope Tigrim (9)

I believe the answer is:

euphrates

(Other definitions for euphrates that I've seen before include "current in the Middle East?" , "River joining the Tigris" , "running water in Iraq" , "Asian river" , "running water in SW Asia" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.