UDON THANI Udon Thani, a northeastern province covering an area of 11,730 square kilometers, is a prime business center of I-San. Located 564 kilometers from Bangkok, it the world heritage site for the prehistoric culture of Ban Chiang.  Udon Thani is probably best known for its archaeological wonders, paramount among them the hamlet of Ban Chiang where the world's first Bronze Age civilization is believed to have flourished more than 5,000 years ago.