Phae Muang Phi Forest Park is located about 18 km from the town on Highway 101. It is regarded as Thailand's Grand Canyon. Phae Muang Phi is noted for its fantastic sandstone formations. Phae means a shrub area and Muang Phi means city of ghosts in Thai. As it is a large quiet haunted place and nobody lives around there, people will easily lose their way when going inside. However, it is well worth a visit for those who appreciate spectacular natural rock formations.
It is actually a shallow depression in the ground where soil and sandstone erosion has produced strange-shape formations like giant mushrooms, cliffs and chimneys. Geologists presumed that the great erosion occurred in the Quaternary period about 2 millions years ago.