Its source is to the west of Whitehorse Hill and slightly south of Cranmere Pool on Dartmoor.
It flows south and then south-west for around 9 km to reach the village of Postbridge where it is spanned by a well-known clapper bridge.
Just above Postbridge the river drops around 2 metres in a short distance and the point is referred to as "Waterfall".
It continues south past Bellever to Dartmeet where it joins the West Dart.
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