O'Eb is a natural site located in Sangkat O'Chras, Khan Pailin about 10 kilometers northwest of Pailin city along the road to Bo Yakha and Bo Tang Sour. It has a waterfall. 

Pailin is a small municipality in the West of Cambodia very closed to the border of Thailand. The provincial capital is called Pailin City and is known to much of the world as being the area where many of the Khmer Rouge leaders came from and retreated after their fall. Until the year of 2001 Pailin was part of the Battambang Province, but was then elevated to city status and thus became a province and autonomous zone of its own. The city was during the 1980s and 1990s was regarded as a major Khmer Rouge strongpoint and resource centre. Even after the death of their brutal leader Pol Pot in 1998, many Khmer Rouge leaders still remained there. Some of the leaders went into hiding in fear of punishment for their crimes, although other leaders or henchmen lived openly in the province. It is said that almost 70 percent of the area's older men were fighters for the Khmer Rouge, but unfortunately none of the regular fighters have yet been brought to justice.

As of September 2007, Pailin's remaining Khmer Rouge leaders were being rounded up to face justice by an international tribunal, including Khieu Samphan and Nuon Chea. So after years of the governmental dump contemplation regarding the crime of the Khmer Rouge, its time for lasting enlightenment of what has happen.

Poipet is now more and more becoming a boomtown attracting Cambodians from around the country seeking to make their fortune, or at least a better salary than back home. Pailin was the major revenue producer for the Khmer Rouge guerrillas, being a major gem producing area as well as a prime logging area.

While gem production seems to have tapered off a bit, other business opportunities and the lifestyle have attracted prospectors to the town. Up until the surrender deal of Khmer Rouge's number three men, Ieng Sary, in 1996, the townsfolk lived under the strict rules of the KR hierarchy, with little freedom of expression and most aspects of life being completely controlled by the paranoid regime.