When the United Kingdom and Siam (Thailand) signed the Anglo-Siamese Treaty of 1909, only Satun remained with Siam, which was then placed under Monthon Phuket (มณฑลภูเก็ต) in 1910, until 1933.
When the United Kingdom and Siam (Thailand) signed the Anglo-Siamese Treaty of 1909, Satun was the only region remaining under Siamese control, which was subsequently placed under Monthon Phuket in 1910 until 1933.