A visa is required when travelling to Cambodia. However, for western travellers, a visa can easily be purchased when arriving at the airport as well as at many check points along the Cambodia-Vietnam, Cambodia-Thailand and Cambodia-Lao borders. The visa requires a valid passport, an application form as well as a passport photograph and costs between $30 and $35. Once a traveller obtains a visa, it is good for 30 days. Certain countries are required to obtain a visa before arriving in Cambodia. It’s always best that visitors check with their local embassy first to find out the exact requirements before travelling to Phnom Penh.