Osmach located in Oddar Meanchey province for Cambodia and Chong Chom is located Surin province for Thailand.
O’ Smach and Chong Chom is the international border crossing between Cambodia & Thailand located in oddar meanchey province around 160km from Siem Reap city. We can get to O Smach by local taxi from Siem Reap it take around 3 hours drive. The border open at 6:00am and close at 10pm. At Thai side there are mini Vans transport passengers to Surin province and it leave every one hours so if you want to continue to Bangkok or another tourist city in Thailand you can take another Vans in Surin province. O smach is very quiet border not like Poi Pet at all especially there are a lot less scam at this border crossing. If you wanted to avoid the crowds and quiet border O smach is your choice.