The Pietrosul (Hungarian: Köves-Somlyó or Köves-Somlyó-patak; Hungarian pronunciation: [ˈkøvɛʃʃomjoː]) is a left tributary of the Mureș in Romania.

[1][2] It flows into the Mureș between Joseni and Remetea.

Its length is 13 km (8.1 mi) and its basin size is 40 km2 (15 sq mi).

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