Poza Azul

The valley of Cuatrociénegas, in central Coahuila, México has the greatest number of endemic species of any place in North America (Stein et al, 2000). With its high biodiversity and more than 70 endemic species, this 200 square km desert valley that lies about 270 km SSE of Big Bend National Park, Texas ranks near the Galapagos Islands in terms of the world's unique ecosystems.

Seen while travelling on a recent trip to Monclova, Mexico for the Christmas holidays.