The Mirna River
The longest river of Istria that springs in the Kotli valley
The Mirna River is the largest river in Istrian County. It is about 53 km long. Hum - the smallest town in the world - is located on its coast. The river Mirna springs in the Kotli valley and passes through the Buzet valley and the Motovun forest, where the most famous Croatian truffle site is located.
The mouth of the river Mirna is a very important location for birds of aquatic habitats, and the fish that live in the river are trout and eels.
The towns on the hills above Mirna are Motovun, Oprtalj, and Grožnjan. From certain places from these towns, there is a beautiful panoramic view of the river and the valley around it.