Anglo-Scottish border English king, Edgar the Peaceful, at his council in Chester. After Kenneth had reportedly done homage, Edgar rewarded Kenneth by granting him Lothian. Despite this transaction, the control of Lothian was not finally settled and the region was taken by the Scots at the Battle of Carham in 1018 and the River Tweed became the "de facto" Anglo-Scottish border. The Solway–Tweed line was legally established in 1237 by the Treaty of York between England and Scotland. It remains the border today, with the exception of the Debatable Lands, north of Carlisle, and a small area around Berwick-upon-Tweed, which was taken
River Sark and was formerly a haven for criminals and outlaws who wished to exploit the weakness of the two countries' border defences. The boundary between the Sark and the Esk is called the Scots' Dike. Its name is not connected with "Cutty Sark". River Sark "Disambiguation: for other meanings, please see Sark (disambiguation) The River Sark or Sark Water is a river best known for forming part of the western border between Scotland and England. Most of its short length, however, is entirely in Scotland. It flows into the estuary of the River Esk just to the south of Gretna. During