The Tamar is a river in south west England, that forms most of the border between Devon and Cornwall . The area is a World Heritage Site due to its historic mining activities. The Tamar's source is less than 6 km from the north Cornish coast, but it flows southward and its course runs across the peninsula to the south coast. The total length of the river is 61 miles . At its mouth, the Tamar flows into the Hamoaze before entering Plymouth Sound, a bay of the English Channel. Tributaries of the river include the rivers Inny, Ottery, Kensey and Lynher on the Cornish side, and the Deer and Tavy on the Devon side. The name Tamar was mentioned by Ptolemy in the second century in his Geography. The name is said to mean Great Water. The Tamar is one of several British rivers whose ancient name is assumed by some to be derived from a prehistoric river word apparently meaning dark flowing and which it shares with the River Thames.The seventh century Ravenna Cosmography mentions a Roman settlement named Tamaris, but it is unclear which of the towns along the Tamar this refers to. Plymouth, Launceston and the Roman fort at Calstock have been variously suggested.
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