The Isonzo River is a river located in northeastern Italy and western Slovenia. It flows for about 138 kilometers (86 miles) and is known for its striking turquoise color, which is due to the minerals in the water. The river originates in the Julian Alps and eventually joins the Soča River. The Isonzo River has historical significance, particularly during World War I, when it was the site of several battles between Italian and Austro-Hungarian forces. Today, it is popular for outdoor activities such as rafting, kayaking, and fishing, attracting nature enthusiasts and adventure seekers alike.