The Soca has its source in Slovenia on the Julian Alps, in the Triglav National Parks. It runs through Slovenia and then Italy
(where it is called Isonzo) for 140 km and then flows into the Adriatic Sea near Monfalcone.
Here a report of one day fishing in the high part of the Soca, in the reserve that stretches from the bridge n the village of Vas na Skali
down to the bridge of Cezsoca.