Watch One for the River: The Sava Story Full Movie Free Online 123Movies. Flowing from the heart of the Julian Alps all the way to Belgrade, crossing four countries and many landscapes before reaching the Danube, the Sava is the home river for most of the team behind and in front of the camera of this film. But despite living next to it, many never use the chance to really get to know it. Join four kayakers for an exciting, 11-day journey across the entire Slovenian part of the river.