North-western Cambodia is a region of Cambodia and includes the provinces of Banteay Meanchey, Oddar Meanchey, Preah Vihear, Siem Reap and the part of Stoeng Treng to the west of the Mekong.
The north is dominated by the Dangrek Mountains which form the natural barrier between Cambodia and Thailand. Much of the southern part of this region is very flat and fertile leading towards the Tonle Sap - Cambodia's great lake.
Siem Reap is by far the largest city, Sisophon and Poipet both small towns, while Anlong Veng just feels like a large village.
North Western Cambodia is home to the infamous K5 mine belt, a (land) mine field 700km long and 500m wide, that runs parallel to the border with Thailand. Although parts of this minefield have been cleared, much remains.
Much of north-western Cambodia live in abject poverty, with the province of Siem Reap being one of the poorest in the country, despite the valuable Angkor Archaeological Park being located within. Like the other regions, infrastructure is a new concept in North-Western Cambodia, with only the national highways paved. Out of the towns, electricity is obtained by using car batteries, at a high cost. Despite the obvious negative effects that a lack of development can have, an advantage (if there was one) would be that the region has been largely left alone by tourists, so those who do tread off the tourist trail get an insight into Cambodia's beautiful struggle.
The region is served by Siem Reap - Angkor International Airport  (IATA: REP | ICAO: VDSR) which has has frequent domestic flights from Phnom Penh and is internationally linked from the following destinations:
The region is linked by road to three Thai border crossings.
The magnificent ruins of several ancient Khmer cities at Angkor Archaeological Park cover some 400 sq km and this is one of the world's great monuments. These include the famous Temple of Angkor Wat and, at Angkor Thom, the Bayon Temple with its countless sculptural decorations. Angkor was declared a UNESCO World Heritage site in 1992 and UNESCO has set up a wide-ranging programme to safeguard this symbolic site and its surroundings.
Angkor itself has no accommodation and few facilities and the nearby town of Siem Reap is the tourist hub for the area.
If Angkor does not fill your appetite for ancient ruins, then there are more at Koh Ker to the north.
Tonle Sap is the largest freshwater lake in south-east Asia and a site of major conservation importance.
Three of Cambodia's six overland crossings with Thailand are in this region: