A coach winds out of Chengdu before dawn and the road climbs into a landscape that switches from rice terraces to silver rivers and coniferous ridges. By midday you’re in Songpan, where a narrow market street and fragments of an old city wall introduce the Qiang and Tibetan cultures that shape the high valleys. On day two, Jiuzhaigou opens like a sequence of glass — tiered turquoise pools, mirror lakes, and cataracts threaded by wooden boardwalks. The valley’s basins were deepened by Pleistocene glaciers; mineral-rich waters and calcite deposition create the vivid blues and greens that give the park its reputation. Day three moves higher to Huanglong, where travertine terraces ripple down the slope — a geological slow-motion of calcium carbonate and seasonal melt.