Potrail Water
From Wikishire
The Potrail Water is a small river of southern Lanarkshire which is one of the two main headwaters of that county's greatest river the River Clyde.
The river begins in a series of hillside burns in the Southern Uplands in the southernmost parts of Laanrkshire, principally those off the slopes of Little Scaw'd Law, Durisdeer Hill and Well Hill, all three summits marking the border of Lanarkshire with Dumfriesshire, and marking too the watershed between the Firth of Clyde to the north and the Solway Firth to the south.
The burns unite and the Portrail Water heads directly north-northeast until it meets the Daer Water at Watermeetings, and below their meeting point the united river is the Clyde itself.
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