Thailand Pathum Thani Travel Information The original name of Changwat Pathum Thani is Muang Sam Khok which was founded during the Ayutthaya era and was the settlement for Mon People migrating from Mohtama during the reigns of King Prasat Thong and King Narai the Great. Wat Chinwararam This monastery is located on the west bank of the Chao Phraya River slightly opposite the mouth of Khlong