Jinsha river big bend run zilan area valley deep and narrow, the terrain close to danger. The great bend in the deep horseshoe-shaped meander is the result of the joint control of several groups of fault structures with different strike directions, such as north to west and north to east. Its two walls dangerous rock steep stand, red sandstone stratum exposed, and affected by the local valley airflow, the valley climate hot, wood sparse wuwu, only some more drought resistant grass and prickly small thickets, presenting a special natural landscape similar to desert. This kind of dry valley landscape is found in several river sections of several main rivers in hengduan mountain. Along the river, there is a road from zhongdian now shangri-la in yunnan province to derong county, the smallest county seat in southwest sichuan. This area was also one of the important sections of the `tea and horse ancient road` where yunnan tea entered Tibet.
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