Mirna (Croatia)
![](/Images/godic/202502/05/Mirna_river_Croatia2623.jpg")
![Another Image of the Mirna River](/Images/godic/202502/05/Mirna_Kotli22624.JPG")
The Mirna is a river in Istria, Croatia. In ancient times it was called the Aquilis. It is Istria's longest and richest river, being 53 km (33 mi) long and having a basin covering an area of 458 km (177 sq mi). It rises near Buzet, and empties into the Adriatic Sea near Novigrad.