What’s the difference between the "upper," "middle," and "lower" parts of Jiuzhaigou?

Upper: Long Lake (the largest) and Five Flower Lake (most colorful)—a must-see. Middle: Nuorilang Waterfall (the park’s iconic waterfall) and Panda Lake. Lower: Sparkling Lake and the entrance area, with smaller lakes. We visit all three via shuttle buses, hitting the highlights of each. Most travelers say Five Flower Lake (upper) and Nuorilang Waterfall (middle) are the standouts—but every corner surprises!