The River Yealm rises at 430 metres above sea level from the Stall Moor mires of South Dartmoor and travels 12 miles to the sea where it is bounded on the West side by Wembury and the other by a deep inlet giving access to the adjoining villages of Newton Ferrers and Noss Mayo.
It also passes by Yealmpton and Brixton on its journey through the South Hams.
Due to its high importance supporting many protected species, the river is a Special Area of Conservation (SAC) and a Site of Special Scientific Interest (SSSI). Although its once large stocks of salmon, brown trout and sea trout have dwindled, the Yealm supports a thriving bass hatchery, and a large oyster bed due to the critical balance of salt and fresh water and phytoplankton needed for cultivation.
The charming villages of Newton and Noss attract sailors, watersports enthusiasts, naturalists and walkers all year round, and there is a seasonal passenger ferry connecting this side of the estuary with Wembury on the other.