Waterfalls of Phu Phan, Dharma Park, Five Thousand-year Civilization, Land of Mi-khit Cloth, Wonderful Nong Prachak Place, and Scented Udorn Sunshine Orchids, Udon Thani, located in Thailand’s northeastern Isan region is a prime business center, particularly as a result of its proximity to Vientiane, the capital of Lao P.D.R. Udon Thani also possesses an archaeological site that is evidence of one of the world’s most ancient bronze-age civilizations.
(http://www.tourismthailand.org/where-to-go/cities-guide/destination/udon-thani/)