Valle de la Luna (moon valley in English) is situated about 10 kilometers from downtown La Paz, in the Pedro Domingo Murillo Province, La Paz Department, Bolivia. It is composed of an area where erosion has worn away the majority of a mountain. Due to being composed of clay rather than rock, over the centuries the elements have created a somewhat odd work of art here, like a desert filled with stalagmites. It is similar to another zone of La Paz that is known as el Valle de las Animas (the Valley of the Souls).
The mountains surrounding La Paz are composed of clay. It is interesting to note that the mineral content of the mountains varies greatly between individual mountains. As a result, the sides of the mountains are different colors, creating very striking optical illusions. A majority of them are a clear beige or light brown color. There are also areas that are almost red, with sections of dark violet.