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 & Dorset Railway Heritage Trust maroon and the other in BR Southern Region green. Somerset & Dorset Railway Heritage Trust The Somerset & Dorset Railway Heritage Trust is a UK-registered charity which owns the museum and railway at Midsomer Norton South railway station. Commercial activities such as catering, retail services and the operation of public trains over the original trackbed come under the control of the Somerset & Dorset Joint Railway Company Ltd., a wholly owned subsidiary of the Trust. It is separate to and should not be confused with the Somerset and Dorset Railway Trust, which is located at the West Somerset Railway's Washford