ma pi leng pass of the four most treacherous and beautiful vietnam

above aerial alpine andorra approaching architecture asphalt beautiful bright canyon catalonia climate cloudscape country covering cultures curve engadine envalira escorca extreme feature fluffy fogging gotthard grass hagiang hairpin highest hill hills land landscape majorca maloja material mountain natural panoramic pass passes peak polarizer pyrenees range ridges road roads rolling rough snake square state steep stone terrain textured thoroughfare traffic type vacations valleys vella vietnam villages