Liddel Water is a river of the Middle Shires. It runs initially through Roxburgh, where it forms a dale named Liddesdale, a district infamous in the history of the border reivers. The lower reaches of the river mark the county boundary of Roxburghshire with Cumberland and later of Cumberland with Dumfriesshire, until the Liddle enters the River Esk. The river was formerly one of the boundaries of the Debatable Lands.
Liddel Water's source is beneath Peel Fell in Roxburghshire, where it is formed by the confluence of Caddroun Burn, Wormscleuch Burn and Peel Burn. Soon afterwards, the nascent Liddel Water is fed by Dawston Burn near the village of Saughtree.
The river continues to swallow tributary streams as it follows its southwesterly course, which takes it through the village of Newcastleton (also known as Copshaw Holm) to that of Kershopefoot, where the burn begins to mark the boundary with Cumberland.
The Liddle Water takes the waters of numerous streams on its course, including:
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- Map: 55°3’-0"N, 2°57’0"W