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A divide.
a divide
I believe its called a water shed but I'm not completely sure about that.AnswerA watershed (one word) is a ridge or other dividing line between stream catchments, although the term is (confusingly) also applied to the catchment area. Another term is drainage basin.
the main river and all of its tributaries are called a river system. The land drained by the river system is called a drainage basin. Drainage basins are separated by the high land in between, known as a divide or watershed.
A central valley.
A ridge, specifically the Mid-Atlantic Ridge.
Continental ridge
The Continental Divide of the Americas is an example of a mountain ridge that separates river systems. Further examples include Northern Divide or Laurentian Divide.
No. A mid-ocean ridge is a chain of mountains and volcanoes in an ocean basin at a site of sea floor spreading.
continmental dividecontinental divide
flanks of the oceanic ridge.
The source or headwaters of a river or stream is the place from which the water in the river or stream originate. These sources are usually small springs found high up in the hills or mountains and near to what is called a drainage divide - a ridge of ground which separates land drainage systems with the waters on one side flowing to a different destination to the waters on the other.