River Otter, Devon River Otter, Devon The River Otter rises in the Blackdown Hills just inside the county of Somerset, England near Otterford, then flows south for some 32 km through East Devon to the English Channel at the western end of Lyme Bay, part of the Jurassic Coast, a UNESCO World Heritage Site. The Permian and Triassic sandstone aquifer in the Otter Valley is one of Devon's largest groundwater sources, supplying drinking water to 200,000 people. The river's source is north of Otterford, where a stream feeds the Otterhead Lakes: and then through Churchstanton before entering Devon. The river flows through a
Dorset United Kingdom. However, Dorset maintains higher summer temperatures than Devon and Cornwall, with average highs of . Excluding hills such as the Dorset Downs, the average annual temperature of the county is . The south coast counties of Dorset, Hampshire, West Sussex, East Sussex and Kent enjoy more sunshine than anywhere else in the United Kingdom, receiving 1,541–1,885 hours a year. Average annual rainfall varies across the county—southern and eastern coastal areas receive per year; the Dorset Downs receive between per year; less than Devon and Cornwall to the west but more than counties to the east. The 2011 Census