A LOT of the land borders won't let people from those 5 countries (Argentina, Brazil, Chile, Peru & South Korea) that get 90 day visa exempt entries bounce out and back in for a stamp
@Amornrat *********
, has a visa run company that goes to that border twice a week so we'll ask her..
Do you know if Chilean passport holders can bounce out and back in at the Nong Khai border?