The Siloli Desert is located at the southeast of Potosi city. It's famous mainly for its rock formations like the Arbol de Piedra. It's part of the Atacama desert the driest in the world.
The Arbol de Piedra (Stone Tree) is a volcanic rock formation in the Desierto Siloli in Bolivia. The rock is unique because it resembles a tree. The Desierto Siloli is considered to be part of the Atacama Desert in neighboring Chile.