The Tarth Water is a river in Peebleshire, 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.

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