Geography of Dorset is the Blackmore Vale, a relatively low-lying area of clays and limestones of Jurassic age. The south-east of the county forms part of the Hampshire Basin, an asymmetric syncline covered in sands and gravels of Paleogene age. The main rivers in the county are the Stour, Frome and Piddle. The Stour is the county's largest river, although its source is in the neighbouring county of Wiltshire. The Frome and Piddle both lie wholly within the county. The whole of Dorset's coastline is designated part of the Jurassic Coast World Heritage Site, and contains examples of many different coastal landforms, reflecting
East Devon East Devon East Devon is a local government district in Devon, England. Its council is based in Sidmouth, and the largest town is Exmouth. The district was formed on 1 April 1974 by the merger of the borough of Honiton with the urban districts of Budleigh Salterton, Exmouth, Ottery St. Mary, Seaton, Sidmouth along with Axminster Rural District, Honiton Rural District and part of St Thomas Rural District. East Devon is covered by two Parliamentary constituencies, East Devon and Tiverton and Honiton. Both were retained in the 2010 general election by the Conservative Party. In the 2001 census it was