July 6, 2022
Isonzo (Slovenian: Soča, German: Sontig) is a 138 km long river in Slovenia and Italy. The spring is located in the Trenta Valley in the Julian Alps of Slovenia, around 1,100 meters above sea level. The river flows past the highest mountain in Slovenia, Triglav (2,864 masl) before flowing south past the cities of Bovec, Kobarid, Tolmin, Nova Gorica and Gorizia. The river empties into the Adriatic Sea near the Italian city of Monfalcone. The river valley formed large parts of the front line between Austria-Hungary and Italy during the First World War. Among other things, a total of twelve battles were fought at Isonzo between May 1915 and November 1917, in which more than 300,000 soldiers from Austria-Hungary and Italy lost their lives. In Slovenia, the river is also called "The beautiful emerald river" because of the emerald green water. It should be one of the few rivers in the world that has such a color throughout the race. Soča inspired the Slovenian poet Simon Gregorčič to write his most famous poem Soči (To Soča), a masterpiece of Slovenian poetry. Isonzo is known for the unique trout species Salmo marmoratus (called marble trout), which lives in the crystal clear water in the upper parts of the river. The species is threatened with extinction due to other fish species being released into the river in the interwar period.