this is the upper rhine valley in southwest germany. there are places here where something valuable and increasingly rare public is up to the surface. clear pure groundwater. pike feel right at home in it as do many other species of fish. some are facing extinction the european is a critically endangered species. own fish need clean water and groundwater is a crucial source of that. the places in this region where the water rising from the depths is so pure this is not the rhine river itself but naturally occurring ponds fed by springs. here the water temperature is 11 degrees celsius all year. the springs and ponds are important and need to be protected. it looks like they can be found anywhere unexpected holes in the ground even in the middle of flattering. the groundwater that feeds the springs some of which ends up in the rhine river itself is the result of a complex process. rain that falls in the fuss because mountains to the west and the black forest up plans to the east feed streams. or seeps directly into the ground through soi