Oddar Meanchey (Khmer: ឧត្តរមានជ័យ, UNGEGN: Ŏttâr Méanchoăy, ALA-LC: Uttar Mānjăy [ʔoɗɑː miəncɨj]; lit.

It borders the provinces of Banteay Meanchey to the west, Siem Reap to the south and Preah Vihear to the east.

After the neighboring Thai province of Inner Cambodia and Oddar Meanchey were returned to Cambodia in 1907, King Sisowath split the province into Battambang and Siem Reap (Oddar Meanchey was included with Siem Reap).

[6] The province was returned to Cambodian rule in 1946 following French diplomatic efforts at the end of World War II.

[citation needed] The Khmer Rouge of Democratic Kampuchea led by Pol Pot (Saloth Sar) and Khieu Samphan rebuilt their former jungle bases in the Dangrek mountain range area, along the border with Thailand and made Anlong Veng their base from 1989 till 1997.