This 7 meters tall rock was carved by the sand and wind erosion in Siloli Desert, next to the famous Salar de Uyuni.
The base of the "tree" is mostly made of quartz, while its upper part has a high concentration of iron. It's this difference in composition that caused unequal erosion and therefore such an unique shape.
The Spanish name for it means "Stone Tree". It's an usual stop for the Salar de Uyuni tours and there is a store on the location..
From Wikipedia:
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visit link)
"Árbol de Piedra ("stone tree") is an isolated rock formation in the Eduardo Avaroa Andean Fauna National Reserve of Sur Lípez Province, Bolivia. Much photographed, it projects out of the altiplano sand dunes of Siloli in the Potosí Department, about 18 kilometres (11 mi) north of Laguna Colorada. Known as the "Stone Tree," it is shaped like a stunted tree about 7 m high. Its shape, particularly the thin stem, are due to strong winds carrying sand and eroding the soft sandstone."