| Tarth Water | |
|---|---|
 Tarth Water | |
  Tarth Water | |
| Location | Peebleshire |
| Coordinates | 55°40′20″N 3°19′45″W / 55.6723°N 3.3291°W --> |
| Basin countries | Scotland |
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.