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The River Culm flows through the Devon Redlands and is the longest tributary of the River Exe. It rises in the Blackdown Hills at a spring near RAF Culmhead in Somerset, and flows west through Hemyock, then Culmstock to Uffculme. The river turns south, through Cullompton (and alongside the M5 motorway), skirting the northern boundary of Killerton Park to join the River Exe on the north-western outskirts of Exeter, a journey of 17 miles. The name of the river is thought to mean 'knot' or 'tie', in reference to the river's twists and loops.
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