This is a hollow surrounded by the Orbate Hill, in the midst of the Cordillera de la Sal ("Salt Cordillera") and right on the border of the Atacama salt mine. It is a geological site of unanticipated beauty. At an altitude of 2,550 meters, this formation was created by the buckling of the Earth's crust, which at this place is formed by sedimentary rocks with interspersions of salt, gypsum, chlorate, borate and outcrops of clay. The action of the wind and of other atmospheric agents has carved out sculptures with sharp ridges, outcrops and hollows from the natural rock, creating a fantastic landscape. The lack of humidity and concomitant absence of animal and vegetable life make this the most moon-like corner of the Earth.
It was accepted as a Nature Reserve in 1982. A sunset visit is recommended to admire the contrasting colors of a peerless landscape.
It is 15 kilometers west of San Pedro de Atacama.

Possible activities:

• Bicycle tourism, rides on traditional bicycles, down specially constructed pathways. One day's ride: 200 to 300 km. from one city to another all along asphalt highways. Stage riding: paved roads alternated with mountain track stretches. "Bici cross": A bicycle ride along rough obstacle-ridden paths. In competitions, cyclists have to complete a 2 km stretch many times, pedaling or running on foot while carrying their bikes on their shoulders.
• Free climbing: mountain climbing on sheer walls using only one's hands and feet, protected by a rope harness.
• Speleology: exploring of the inner formations of caves, caverns, galleries and underground lakes.
• Photography, interior and exterior views shot where authorized.
• Sandboarding, sledding on sandy surfaces with proper boards.