Wiang Sa district, Nan
Wiang Sa is a district in the central part of Nan province, northern Thailand.
Geography
Neighboring districts are, from the south clockwise: Na Noi, Ban Luang, Mueang Nan, Phu Phiang of Nan Province, Rong Kwang, Song of Phrae province. To the east it borders Xaignabouli province of Laos.The eastern part of the district is in the Luang Prabang Range mountain area of the Thai highlands.
History
The minor district Mueang Sa was created in 1908, consisting of the seven tambons : Mueang Sa, Ai Na Lai, Ban San, Ban Khueng, Pong Sanuk, Nam Khao, and Lai Na split off from Mueang Nan District. In 1909 it was upgraded to a full district. In 1917 it was renamed Phun Yuen, as the district office was in that tambon. In 1939 it was again renamed with its historical name, only leaving out the word Mueang which was reserved for the capital districts of provinces. The district was renamed Wiang Sa on 23 January 1986.Administration
Central administration
Wiang Sa is divided into 17 sub-districts, which are further subdivided into 128 administrative villages.| No. | Name | Thai | Villages | Pop. |
| 1. | Klang Wiang | กลางเวียง | 15 | 10,791 |
| 2. | Khueng | ขึ่ง | 7 | 4,069 |
| 3. | Lai Nan | ไหล่น่าน | 8 | 3,472 |
| 4. | Tan Chum | ตาลชุม | 7 | 3,824 |
| 5. | Na Lueang | นาเหลือง | 7 | 3,112 |
| 6. | San | ส้าน | 10 | 7,065 |
| 7. | Nam Muap | น้ำมวบ | 8 | 3,346 |
| 8. | Nam Pua | น้ำปั้ว | 7 | 4,054 |
| 9. | Yap Hua Na | ยาบหัวนา | 7 | 5,122 |
| 10. | Pong Sanuk | ปงสนุก | 4 | 1,366 |
| 11. | Ai Na Lai | อ่ายนาไลย | 11 | 6,830 |
| 12. | San Na Nong Mai | ส้านนาหนองใหม่ | 4 | 1,902 |
| 13. | Mae Khaning | แม่ขะนิง | 7 | 3,768 |
| 14. | Mae Sakhon | แม่สาคร | 6 | 2,772 |
| 15. | Chom Chan | จอมจันทร์ | 8 | 3,973 |
| 16. | Mae Sa | แม่สา | 7 | 2,945 |
| 17. | Thung Si Thong | ทุ่งศรีทอง | 5 | 2,484 |
Local administration
There are three sub-district municipalities in the district:- Wiang Sa consisting of parts of sub-district Klang Wiang.
- Klang Wiang consisting of sub-district Pong Sanuk and parts of sub-district Klang Wiang.
- Khueng consisting of sub-district Khueng.
- Lai Nan consisting of sub-district Lai Nan.
- Tan Chum consisting of sub-district Tan Chum.
- Na Lueang consisting of sub-district Na Lueang.
- San consisting of sub-district San.
- Nam Muap consisting of sub-district Nam Muap, San Na Nong Mai.
- Nam Pua consisting of sub-district Nam Pua.
- Yap Hua Na consisting of sub-district Yap Hua Na.
- Ai Na Lai consisting of sub-district Ai Na Lai.
- Mae Khaning consisting of sub-district Mae Khaning.
- Mae Sakhon consisting of sub-district Mae Sakhon.
- Chom Chan consisting of sub-district Chom Chan.
- Mae Sa consisting of sub-district Mae Sa.
- Thung Si Thong consisting of sub-district Thung Si Thong.