Inquiry Submission By augusta

Hi! ?Can someone tell me if Proof of onward travel is necessary when crossing borders overland in Southeast Asia? For example if I take the bus from HCMC in Vietnam to Phnom Penh in Cambodia.

Would it make a difference in this regard if I apply for an e-visa in advance or if I get the visa on arrival (when applicable)?

The countries I?m planning to travel are the usual suspects (Vietnam, Cambodia, Laos, Thailand, Myanmar) ­čÖé

Thanks in advance!