what is the coldest river in the world

The coldest river in the world is the Neretva River, which flows through Bosnia and Herzegovina and Croatia. The river originates high in the Dinaric Alps at an elevation of about 1,227 meters (4,026 feet) above sea level. This high altitude source, along with glacier runoff, keeps the river's temperature extremely low, especially in the Upper Neretva region where the water temperature can be as cold as 7-8 degrees Celsius (around 44 degrees Fahrenheit) even in the summer. The Neretva River is a karst river known for its clean, pure water and deep greenish-blue color. It stretches approximately 230 kilometers (about 140 miles) with the majority of its course through Bosnia and Herzegovina. The river's cold temperatures and unique ecology support many species of fish, including several endangered and endemic trout species. In summary, the Neretva is notable as the coldest river in the world due to its glacier-fed source in the high Dinaric Alps and its sustained low temperatures throughout its course.