Lagoons of El Tobar Nature · Beteta, Serranía Alta, Cuenca Karst lake complex next to the hamlet of El Tobar. The Laguna Grande is meromictic: it holds fresh water at the surface and water up to three times saltier than the sea at the bottom, without the two layers mixing, a phenomenon of worldwide scientific interest. Photo: Mabelcalabuig (CC BY-SA 3.0 es) What to see and do in Beteta