Today I hitchhiked northwest out of Buon Ma Thuot in Dak Lak province, getting as far as Ea Sup. I went this way because it was the route Google Maps suggested as the shortest or quickest in the direction toward Hue.
But I met a guy there when I was about to head east out of town before the storm hit and he told me I had to come with him to some office because I couldn't travel in this border area since I'm a foreigner.
It seems neither me nor Google Maps was aware of this restriction. I know I'm a bit off the tourist trail, that's kind of the point. But I'd like to be able to choose a route knowing in advance that I won't get sent back and lose a day.
Where can I find good information about this?