Amphoe Tan Sum is a amphoe of Changwat Ubon Ratchathani.
Boundaries: Royal Thai Survey Department, OCHA ROAP (https://data.humdata.org/dataset/thailand-administrative-boundaries) via geoBoundaries, CC BY 3.0 IGO (https://creativecommons.org/licenses/by/3.0/igo/); boundaries modified
| Chik Thoeng | no seat recorded | 5 k |
| Kham Wa | no seat recorded | 4 k |
| Na Khai | no seat recorded | 7 k |
| Nong Kung | no seat recorded | 4 k |
| Samrong | no seat recorded | 4 k |
| Tan Sum | Tan Sum | 9 k |
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