The Tarth Water is a river in Peeblesshire, in the Scottish Borders. It forms part of the River Tweed system. The river with a total length of 7.1 miles, rises on Mendick Hill, a Marilyn, and flows past the villages of Dolphinton and Blyth Bridge before converging at Drochil Castle with the Lyne Water, a tributary of the Tweed.
See also List of rivers of Scotland List of places in the Scottish Borders List of places in Scotland
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