Upper Flood Swallet which was originally known as Blackmoor Flood Swallet, is an exceptionally well-decorated cave near Charterhouse, in the carboniferous limestone of the Mendip Hills, in Somerset, England.
Upper Flood Swallet, formerly referred to as Blackmoor Flood Swallet, is a remarkably decorated and impressive cave situated near Charterhouse in the Carboniferous limestone of the Mendip Hills in Somerset, England.