You can also get into Cambodia by land from Thailand, Vietnam and Lao. Tourists can pass the border at the following Entry Points:
There are 9 international border gates for crossing the border between Thailand and Cambodia
Poi Pet (Cambodia) and Aranyaprathet (Thailand)
This border connecting Bangkok or North-East of Thailand to Phnom Penh via North-West part of Cambodia including Angkor area. It opens from 7 am and closes at 5 pm, the visitors can get entry visa for Cambodia on arrival with cost of US$20. Taxi also available there, especially for Siem Reap - Angkor ( but the road are under bad situation ).There are al least two trains leave here each day for Bangkok, one at 6:40 am and the other at 1 pm for Bangkok.
Cham Yem (Cambodia) and Trad (Thailand)
This border connecting South-East of Thailand - Trad Province with Cham Yem in Koh Kong Province of Cambodia. Visitor have to get visa at Royal Cambodian Embassy in advance. From Koh Kong, visitors can continue their trip to Sihanouk Ville, the seaside paradise of Cambodia, by fast ferry around 3 hours and then connect to Phnom Penh City by National road No.4 (good road) with 225km.
O'Smach(Cambodia) and Chong Jom (Thailand)
This border is remote border crossing north of Siem Reap in Oddar Meanchey province. From Siem Reap, visitors can travel to Kralahn, then north to Samrong and then on to the border. Guesthouses are available in Samrong.
Anlong Veng (Cambodia) and Chong Sa Ngam (Thailand)
This border is remote border crossing northwest of Siem Reap in Oddar Meanchey province, opposite Thailand's Si Saket province.
Phsar Prom Pailin (Cambodia) and Ban Pakard, Chantaburi (Thailand)
This border is located in Pailin, Cambodia, opposite Thailand's Chantaburi province. Taxi is available from Pailin to Battambang with 3 or 4 hours driving but road conditions change with the season.
Doung International Check Point, Battambang ( Cambodia) and Ban Laem, Chantaburi (Thailand)
This border is located in Kamreang, Battambang province, Cambodia, opposite Thailand's Chantaburi province.
Choam (Cambodian) and Sangam (Thailand)
This border is located in Oddar Meanchey Province opposite Thailand’s Sysaket Province.
Sihanouk Ville International Check Point
This border is located in Sihanouk Ville Province - Cambodia.
Preah Vihear International Check Point (Preah Vihear Province)
This border is located in Preah Vihear Province - Cambodia
Bavet, Cambodia and Moc Bai, Vietnam
The Moc Bai crossing is the closest and most convenient to Phnom Penh and Ho Chi Minh City. The 230 km road from Phnom Penh, through the Moc Bai crossing to Ho Chi Minh City is in good condition. Cambodian visa are available at the border.
Kaam Samnor, Cambodia and Vinh Xuong-Chau Doc, Vietnam
Cruise ship can be possible on the Mekong river from Vietnam to Phnom Penh capital city. By this route, visitors can enjoy the Mekong's views and discovery the new area of Cambodia with combine together nature, culture and life stiles of the people. Visitors access by these ways are required to have an entry visa for Cambodia in advance. Cambodian visas are available at the border.
Phnom Den, Takeo, Cambodia and Tinh Bien, Vietnam
This border crossing in Takeo province Cambodia is about 10 km south of the the Vietnamese city of Chau Doc. Coming from Cambodia, this crossing can be accessed from either Phnom Penh or Kampot.
Trapeang Phlong, Kampong Cham, Cambodia and Xa Mat, Vietnam
This border is recently opened. In Kampong Cham province, Memot district, bordering the Vietnamese province of Tay Ninh. Visas are not available at the border. You must get your visa in advance.
Prek Chak, Cambodia and Xa Xia, Ha Tien Vietnam
Ha Tien border crossing is now a international border crossing open to foreign travelers. After years of anticipation (since the opening of the Koh Kong crossing in 1998), the opening of the Ha Tien crossing represents the removal of the last road block on the coastal travelers trail from Koh Chang Thailand, though the beach towns of Cambodia and on to southern Vietnam and Phu Quoc Island. Overland travelers can now beach hop across Indochina without ever having to leave the coastal roads. Visas are not available at the border. You must get your visa in advance.
Oyadav (Cambodian side) and Lethanh (Vietnamese side)
On the Cambodian side, the Oyadav international border checkpoint is located in Rattanak Kiri Province, and on the Vietnamese side, the Lethanh international border checkpoint is located in Gia Lai Province. Tourists can get access to Cambodia from Vietnam through the gates. Visas on arrival are available there.
Samrong (Cambodian side) and My Quy Tay (Vietnamese side)
On the Cambodian side, the Samrong international border checkpoint is located in Svay Rieng Province, and on the Vietnamese side, the My Quy Tay international border checkpoint is located in Long An Province. Tourists can get access to Cambodia from Vietnam through the gates. Visas on arrival are available there.
Dom Kralor, Stungtreng Cambodia and Voeung Kam, Laos
There are two border crossing points with Laos relatively close to one another:
1) The river crossing at Koh Chheuteal Thom;
2) The road crossing at Dom Kralor. Expect extra fees for “stamps” on both sides of the border.
Going the other way, from Laos to Cambodia, you can cross the border by road or river. By river, take a boat from Don Khone or Don Khong to Voeung Kam. From Voeung Kam, get a Cambodian boat to Stung Treng. Then take a bus to Phnom Penh.
Cambodian visas are available at the border (Don't forget to bring a photo!). No special permits required from either Cambodia or Laos. Open 08:00-17:00.