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
Dorset East and Hampshire West (European Parliament constituency) and South Dorset. The constituency replaced most of Wessex and parts of Hampshire West. It was itself replaced by much of Dorset and East Devon and parts of Itchen, Test and Avon in 1994. These seats became part of the much larger South West England and South East England constituencies in 1999. ! style="background-color: " | Dorset East and Hampshire West (European Parliament constituency) Dorset East and Hampshire West was a European Parliament constituency covering most of Dorset and parts of western Hampshire in England. Prior to its uniform adoption of proportional representation in 1999, the United Kingdom used first-past-the-post