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arid asia background barren beautiful beauty blow blowing blue brown clear climb climbing cloud cloudy color contrast dene desert deserted desolate dune dunes dust expedition exploration foot footprint footprints footstep grain grains heat landscape line nature nobody orange outdoors peaceful pure purity ridge ripple ripples road route sand sandy scene scenery scenic serene shadow sightseeing sky slope smooth sunny surface terrain thirsty tibet tourism trace track travel trek trekking uphill vacancy view walk walking way wild wilderness