Russian river that flows to the Caspian Sea at Guryev (4)

I believe the answer is:

ural

(Other definitions for ural that I've seen before include "Europe/Asia river" , "The - mountains separate Asia and Europe" , "Russian river, rising in the mountains between Europe and Asia" , "Mountain range in Russia" , "River feeding Caspian Sea" .)

I've seen this clue in The Mirror.

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