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Amphoe Sadao

Sadao
สะเดา
Amphoe
Amphoe location in Songkhla Province
Amphoe location in Songkhla Province
Coordinates: 6°38′19″N 100°25′26″E / 6.63861°N 100.42389°E / 6.63861; 100.42389Coordinates: 6°38′19″N 100°25′26″E / 6.63861°N 100.42389°E / 6.63861; 100.42389
Country  Thailand
Province Songkhla
Seat Sadao
Amphoe established 1909
Area
 • Total 1,029.273 km2 (397.405 sq mi)
Population (2009)
 • Total 120,306
 • Density 116.5/km2 (302/sq mi)
Time zone THA (UTC+7)
Postal code 90120
Geocode 9010

Sadao (Thai: สะเดา) is a small town a.k.a. Danok (Thai: ด่านนอก; rtgsDannok) and district (Amphoe) on the border of Malaysia in the Songkhla Province, southern Thailand.

Historically Sadao is part of Kedah in the district of Changlun, which means 'an elephant falls' in Thai. The district was formerly part of Changlun, and was then under the overlordship of Malay Sultanate of Kedah (known as Syburi in Thai). Sadao is called Sendawa in the Malay.

When the Britain and Siam (Thailand) signed the Anglo-Siamese Treaty of 1909, deciding what belonged to whom, Changlun was divided into two parts. The main border town of Changlun became the district of Kubang Pasu, now in Kedah of Malaysia. The rest remained Thai. Tambon Sadao, together with the former minor district (King Amphoe) Prik, forms modern Sadao.

The name Sadao is the Thai word for Neem Tree.

Neighboring districts are (from the west clockwise) Khuan Don and Khuan Kalong of Satun Province, Khlong Hoi Khong, Hat Yai, Chana and Na Thawi of Songkhla Province. To the southwest is the state of Kedah and Perlis in Malaysia.


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