This 1989 book covers the geology and geomorphology of the Carboniferous Limestone areas of Wales, and summarises the state of knowledge of the main cave systems including the longest and deepest in Britain. It sets out to assess the morphological evolution of the cave systems and the associated landscape features, particularly in light of the effects of successive glaciations. The book also covers related subjects including the biology of the cave faunas, important archaeological discoveries in Welsh caves and the hydrology of the limestone masses. On its publication, this was the first book to give a general survey of the subject. It will continue to provide a valuable reference for cavers and also for geologists, geographers, biologists and archaeologists with special interests in the area.