Cuatro Cienegas' two main tourist attractions are havens for endemic species. Poza Azul, one of many desert pools connected by underground rivers, is home to the visitor's centre, a bright blue pool and three rare semi-aquatic endemic tortoises. Las Arenales is an area of white calcite sand dunes,...
This Poza has been turned into to a recreational area where you can swim, something you cannot do in the other pools. There are straw pagodas for shade but bring drinks as the shop is only open on weekends. Steps lead down to the pool, which is filled with fairly warm water but fed with cold water...