Tambon
Si Don Chai (Thai: ศรีดอนชัย) is a tambon (subdistrict) of Chiang Khong District, in Chiang Rai Province, Thailand. In 2013, it had a population of 8,813 people.[1] The tambon contains 18 villages.
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20°07′48″N 100°21′41″E / 20.13000°N 100.36139°E / 20.13000; 100.36139