Watch on Soap2day. Tongpan is a 1977 Thai 16 mm black-and-white docudrama that re-creates a seminar that took place in Northeast Thailand in 1975 to discuss the proposed Pa-Mong Dam on the Mekong. Interwoven are sequences depicting a poor farmer, Tongpan, who had lost his land to another dam some years before, and his struggles to make ends meet.