Phu Kao - Phu Phan Kham National Park, an area in upper northeastern plateau, locates in the lower part of Udon Thani Province and lupper part of Khon Kaen Province. The main geology of this area is mountains of sandstone, has sandstone stratum on the top layer of soil, has hard soil or sandy hard soil beneath, and has laterite and sandy soil scattering all over the area. There are plants, animals, and naturally beautiful scenery. The area consists of deciduous forest and is about 322 squares kilometers.

The appearance of Phu Kao looks like frying pan which has great plain in the center. It can be assumed that this area is the remains of a volcano extinguished millions of years ago, or layers of rock in this area bending up to being mountain ridges. Phu Kao Mountain Range is two peripheral lines of mountain; the outer line consists of high mountains; the inner line consists of lower mountains which its hillside is not much slope. Most of the area alternates between high and low, and some are plains.

Phu Phan Kham, in Phu Phan Mountain Range, is a long mountain range lying northeast and southwest. The southwest part was a lower vast-plain of Lam Nam Phong, the very big valley, which, after finished building Ubonratana Dam, is now a lake and becomes half area of Phu Phan Kham. There are deciduous forest and mixed forest growing on the rocky soil.

Rekha Khanit and Muem Caves

The remains, believing older than 3,500 years, in the archeological site shows the evidence that human of this 'Ban Chiang Era' lived their life by hunting according to the color painting and rock carving on the wall of caves.

Beautiful Scenery of Ubonrat Dam and her Islands

This place is suitable for camping and traveling by boat. Traveler can travel to Pramong Village (Fishery Village), Non Sung District, Udon Thani Province, and to buy fish in Ubonratana District, Khon Kaen Province.

Ham Tang

This is the existing of nature like Sao Chaliang in Pha Tam, that is; there are rock columns, caused by the erosion from water, rain and wind for a long time, which have rock floor on top look like mushroom.

Tatfa Waterfall

They are the wonderful waterfalls, located in Phu Kao, and has more water only in rainy season.