Chanthaburi is a town (thesaban mueang) in the east of Thailand, at the banks of the Chanthaburi River. It is the capital of the Chanthaburi Province and the Mueang Chanthaburi district. The town covers the two tambon Talat and Wat Mai of Mueang Chanthaburi district. As of 2005, the town has a population of 27,602. The Cathedral of the Immaculate Conception, the principal church of the Roman Catholic Diocese of Chanthaburi, is the largest church in Thailand.