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
Area de Conservación Guanacaste World Heritage Site marine habitats.. It formally became part of National System of Conservation Areas—SINAC in 1994, and a World Heritage site in 1999. The World Heritage site includes: Area de Conservación Guanacaste World Heritage Site The Area de Conservación Guanacaste is a network of protected areas and a World Heritage site in Guanacaste Province, in northwestern Costa Rica. The area of the national parks combined totals 1470 square kilometers as of 2004. This reflects a long-term process of growth, which started with the establishment of Santa Rosa National Park in 1971. Over several decades, surrounding lands were purchased and nearby national parks