Spirits or ghosts are known generically as phi (ผี) and they may be found, among other places, in certain trees, burial grounds near Buddhist temples, some houses, as well as mountains and forests. The Phi Pan Nam Range (ทิวเขาผีปันน้ำ), The mountain range of the spirits dividing the waters that divides the Mekong from the Chao Phraya watershed, is named after the ancient spirits believed to dwell in the mountains.