he Dragonja is a 30-kilometre (19 mi) long river in the northern part of the Istrian peninsula. It is a meandering river with a very branched basin and a small quantity of water. It has a pluvial regime and often dries up in summer. It features very diverse living environments and is home to a number of animal and plant species.
The river is the third-longest river in Istria, after the Raša and Mirna rivers. It is the largest river of the Slovenian coast that flows into the Adriatic Sea. It is also the only Slovenian river that does not flow through settlements and that flows in its entirety over the flysch terrain.
The Dragonja originates from several sources in the Šavrin Hills and flows west to the Gulf of Piran, part of the northern Adriatic Sea. It is joined by two larger tributaries from the right side (Rokava and the Drnica Creeks) and one larger tributary from the left side (Poganja Creek).
