Cambodia is in the tropical monsoon, situates between Vietnam and Thailand, and shares border with Laos at northern part, Southeast Asia. Cambodia covers 181,035 square kilometers of land and has a population of 15 million with density of 82 people per square kilometer.
Yes, Cambodia is a truly safe country. There are occasional reports of petty theft and the occasional bar fight, but these can easily be avoided (especially the latter) if you exercise common sense. Do not leave your bag sitting at your feet while riding around in a tuk tuk or leave your expensive jewelry, cash or any valuable objects at unattended in a hotel’s room (better to keep it in a safety box). You will be warned not to carry much cash with you whenever you are on a trip. You don’t have to worry about landmines when you travel with local tour guide, 90% of landmines have been disarmed since the war completely ended. However, you are not allowed to enter a zone where you can see warning landmine boards especially the areas in the jungles near the borders.
Cambodia has two important international airports in Phnom Penh, Sihanoukville & Siem Reap. If you travel from Europe, you always transit in Thailand or Vietnam and there are direct flights to Cambodia if you travel from Asia countries including Philippine, Malaysia, Singapore, Hong Kong, Thailand, Laos, Vietnam etc.
By border crossing:
Thailand: Poi Pet (Aranyaprathet) in Banteay Meanchhey, Cham Yeam (Had Lek) & Daun Lem (Ban Laem) in Koh Kong, O’Smach (Chong Jom) & Anlong Veng (Chong Sa Ngam) in Preah Vihear.
Vietnam: Ba Vet (Moc Bai) & Kaam Samnor (Ving Xuong) in Svay Rieng, Phnom Den (Tinh Bien) in Ta Keo and Prek Chak (Ha Tien) in Kampot.
Laos: Dom Kralor (Veun Kham) in Stung Treng.
By speed boat:
Vietnam: If you visit Mekong Delta River & Can Tho in Vietnam, you can catch speed boats from Chau Doc border (Cambodia’s site: Kao Orm Samnor) to Phnom Penh Capital. The boat excursion takes approx. 6 hours depending on the water level.
More detail: https://www.guidingcambodia.com/cambodia-frequently-asking-questions