Wild Wonders of Europe / Hermansen / Unique groundwater fed seasonal turlough lake, Burren National Park, County Clare, Republic of Ireland, June 2009

Jack Dykinga / Panoramic view of Cenote Oxpeejool (sink hole) with its extensive underground chambers created by groundwater, near Tekax, Yucatan, Mexico October 2009

Willem Kolvoort / Old freshwater wells in woodland that were made by man to gather the groundwater and to suppy nearby papermills, central Holland