Google maps indicates 2 possible border crossings between Luang Prabang, Laos and Nan, Thailand. (link below). The first and shortest via Muang Ngeun and then one to the south close to Kengsao. Having great difficulty in establishing if this second route is a legitimate point of entry/exit? Doesn't seem to appear on any lists of border crossings. If anyone can confirm it would be appreciated. Google Maps P.S. tried to load a screen grab of this image at 877kb but it was rejected as being too large, not sure what the go is there???