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
Somerset and Dorset West (European Parliament constituency) constituency replaced Somerset and parts of Wessex. It was itself replaced by much of Somerset and North Devon and parts of Bristol and Dorset and East Devon in 1994. These seats became part of the much larger South West England constituency in 1999. Somerset and Dorset West (European Parliament constituency) Somerset and Dorset West was a European Parliament constituency covering all of Somerset in England, plus parts of Avon and western Dorset. Prior to its uniform adoption of proportional representation in 1999, the United Kingdom used first-past-the-post for the European elections in England, Scotland and Wales. The European Parliament constituencies