High Quality Content by WIKIPEDIA articles! Saane (in German) or Sarine (in French) is one of the largest rivers in Switzerland. It is 128 km long and has a drainage area of 1,892 km². It is a tributary of the river Aar. The source is at the foot of the Sanetschhorn, in the western part of the Bernese Oberland. A river is a natural watercourse, usually freshwater, flowing toward an ocean, a lake, a sea or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including stream, creek, brook, rivulet, and rill, there is no general rule that defines what can be called a river. An exception to this is the stream. In some countries or communities a stream may be defined by its size. Many names for small rivers are specific to geographic location, one example is Burn in Scotland and North-east England. Sometimes a river is said to be larger than a creek, but this is not always the case, because of vagueness in the language.