Suwannaphum is a district of Roi Et province, in eastern Thailand. It is named after the legendary country of Suwannaphum, which accordin…Suwannaphum is a district of Roi Et province, in eastern Thailand. It is named after the legendary country of Suwannaphum, which according to Thai tradition was on the Chao Phraya plain. It was the seat of a small Lao mandala kingdom until the Laotian Rebellion of 1826-1829 ended vestiges of Lao independence west of the Mekong.