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
Operational Guidelines for the Implementation of the World Heritage Convention June - 1 July) in Paris. The Drafting Committee and the World Heritage Committee prepared the text. It contained four chapters and twenty-eight paragraphs. In October same year, the Operational Guidelines for the Implementation of the World Heritage with 27 paragraphs followed. A year later, at the Second Session of the Intergovernmental Committee for the Protection of the World Cultural and Natural Heritage, the Operational Guidelines was adopted with 30 paragraphs. The World Heritage Committee, the main body responsible for the Implementation of the World Heritage Convention, has revised its text ever since adding paragraphs updating it with new concepts,