Surrounded by cols of more than 5000 m, inaccessible throughout the winter, Ladakh, or "little indian Tibet", is one of the most isolated region of northern India. The great Zanskar Crossing is a mythical trek which travels through the whole region, from north to south, from the Indus river to the river Zanskar, and all along secular paths : deep canyons, high desolated plateaux overhanging by jagged summits, Middle-Aging villages and monasteries appearing intact and protected from any outside influence.