The Soca river valley is a magic world of mysterious mountains, emerald green water, awesome waterfalls, impressive streams and wild canyons. This is the gravel basin of the Julian Alps and the sandy lagoon of the Adriatic sea just above the Italian town of Trieste.

The crystal clear and emerald green Soca is for many the most beautiful river in Europe. The 137 kilometers long river comes to the outside world as a karst spring in the valley of Trenta located in the Triglav National Park at an altitude of 1050 meters.

From here on it flows through rapids towards the adrenaline sport packed town of Bovec, turns south just above Kobarid and continues towards Tolmin where it slows down, forms a beautiful small lake at Most na Soči and flows steadily to Kanal ob Soči and Solkan.

After almost 96 kilometers, Soca river crosses the Italian border, changes it's name to Isonzo, slows down even more flowing through the flat Friuli farmland and sometimes even sinks into the gravel during the dry season. It finally flows out to the Gulf of Trieste, creating a beautiful natural reserve where a variety of rare animal life found their home. 

According to en.wikipedia