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 Operational Guidelines for the Implementation of the World Heritage Convention The Operational Guidelines for the Implementation of the World Heritage Convention are a series of instructions to signatory nations regarding the proper implementation of the 1972 Convention Concerning the Protection of the World Cultural and Natural Heritage. The guidelines were adopted by the UNESCO World Heritage Committee at its first session and amended at its second session in 1978. The first text of the Operational Guidelines was titled Operational Guidelines for the World Heritage Committee. It dates back to 1977 at the First Session of the World Heritage Committee (27