back to 1900m: eastern Tibet means a lot of climbing because we constantly go from passes that are between 4000 and 5000 m high, down to the Mekong river or Yanktse river that are at 1900/2000 m.
de retour a 1900 m d'altitude: beaucoup de deniveles pedales au Tibet oriental, parce-que nous passons constamment de cols qui sont entre 4000 et 5000 m d'altitude aux fonds de vallee pour traverser le Mekong ou le Yanktse a 1900/2000 m.
