The Isonzo/Soča River (Slovenian: Soča; Italian: Isonzo; Friulian: Lusinç) is a 140 km long river that flows through Western Slovenia and then flows into Northeastern Italy.
It is a characteristic alpine river, whose source is located at an altitude of 1,100 meters. The river rises in the Julian Alps, west of Mount Triglav (2864 m), the highest peak in Slovenia. After crossing this mountain, its course heads south through the towns of Bovec, Kobarid, Tolmin, Nova Gorica (where the Solkan Bridge is located) and Gorizia, finally flowing into the Adriatic Sea, near the Italian town of Monfalcone. Thus, the Soča runs 99 km in Slovenia and 41 km in Italy.
The Soča Valley (or Isonzo Valley) was the scene of one of the largest war operations of World War I, between May 1915 and November 1917. This period saw the Twelve Battles of the Isonzo on the Italian Front, in which more than 300,000 Italian and Austro-Hungarian soldiers lost their lives.
The famous stretch for kayaking/packrafting is the stretch that goes from the villages near Bovec (multisport base in the area) to Tolmin, being the last stretch from Kobarid to Tolmin a stretch of calm water, very nice but without remarkable rapids.
Sergi, explain us a little more...