Inner Cambodia

Inner Cambodia (from Thai: เขมรส่วนใน Khamen Suan Nai 'inner Khmer') is a historical region of present-day Cambodia that was under the direct rule of Siam (Thailand) between 1795 and 1907.

It was ruled by a Bangkok-appointed governor who held the title Aphaiphubet.

The present-day Cambodian cities of Battambang (known in Thai as Phra Tabong), Siem Reap (Siammarat), Serei Saophoan (Sisophon), and Phnom Srok (Phanom Sok) were all within the region, which was administratively separated from Outer Cambodia, which continued to be ruled by the Cambodian monarch under Siamese suzerainty until 1867.

Inner Cambodia was ceded to France with the Franco-Siamese treaty of 1907.

[1] Following the Franco-Thai war in 1941, Thailand briefly annexed the region and established the areas as Phibunsongkhram, Phra Tabong and Nakhon Champasak provinces.