The traditional source of the Tweed is at Tweed’s Well at an altitude of 385 metres (1263 ft), although the highest of the burns that runs down to Tweed’s Well actually rises at 460 metres. The true, physical source of the Tweed lies in the headwaters of the Cor Water, which is much larger than the Tweed Burn when they join, and is either the top of the Powskein Burn which rises off the Crown of Scotland at 530 metres (1738 ft) or of the Whitehope Burn that rises on Whitehope Knowe, also at 530 metres. From its traditional source, the main channel flows for 156 kms (97.5 miles) to the sea at Berwick Upon Tweed, joined by many tributaries along the way . The number and size of these tributaries mean that the Tweed is not so much a single channel as a collection of rivers that join together. Although the Tweed is sometimes viewed as a Scottish river system, 20% of its area is in England and, of course, its estuary is at Berwick Upon Tweed - and the first 20 miles of the main stem flow through the Northumberland countryside.
The Catchments of the Tweed and Eye