It is about 60 kilometres from cang long to the east of snow mountain peak and the forest . a light yellow , calcareous heap covered the surface of the earth . like a golden dragon running swiftly out from the boundless virgin forest 黄沟深藏于松潘县城东60公里藏山的怀抱,在雪峰与森林掩映下,一条长3 . 6公里宽30 - 170米的浅黄色地表钙华堆积体,如一条金色巨自莽莽苍苍的原始森林中奔腾而出。