The Mirna (Italian: Quieto) is a river in Istria, Croatia.

It is Istria's longest and richest river, being 53 km (33 mi) long and having a basin covering an area of 458 km2 (177 sq mi).

[1] It rises near Buzet, passes along Motovun and empties into the Adriatic Sea at Antenal, near Novigrad.

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