离开珍珠滩，沿着环山公路下行，有一片宽阔无比的山谷。山谷空旷，草木丛生，中间一缕清泉婉蜒滑过，充向下游的镜海。小河旁有几户民居，如世外桃源。山谷两侧是雄伟挺拔的山峰，秋天来临时，秋色染林，仿佛有一枝神厅的画笔，肆意将绛红、桃红、暗紫、墨绿、碧绿、鹅黄涂抹在山上。
　　 镜海紧邻在空谷的下游，湖呈狭长形，长约一公里，为林木所包围。对岸山璧像一座巨大的石屏风右侧是镜海的下游。毗邻诺日朗群海；左侧是镜海上游，与镜海山谷衔接。镜海的倒影独霸九寨。它就像是一面镜子，将水上的景物毫不失真的复制到水下来。来游九寨沟的宾客，莫不为镜海倒影的传神而叹为观止。
　　　 名人题咏

我影投镜海，镜海留我心。
白首不相忘，悠悠九寨情。
　　　　　　　　　 ——陈之光

From Pearl Beach, mountains along the road down, there is an extremely broad valley. Valley open, thorn, the middle ray of springs, serpentine slides, filling the sea to the downstream mirror. There are several families of small riverside houses, such as Xanadu. Tall and straight sides of the valley is the majestic mountain, the fall comes, Autumn dyed forest, if there is a God of the Office of the brush, to indulge Jiang Hong, pink, dark purple, dark green, dark green, light yellow smear on the mountain.
Mirror near the sea in the lonely valley of the River, the lake was long and narrow shape, about one kilometer, surrounded by the trees. Other side of the mountain like a huge stone Pik screen on the right is the mirror downstream of the sea. Snow Day Long group adjacent to the sea; the left is a mirror upstream of the sea, the sea valley converge with the mirror. Mirror reflection of the sea to dominate the Jiuzhaigou. It's like a mirror, the water features will be copied without distortion to the water down. To visit Jiuzhaigou guests, everyone as a mirror reflection of the vivid and amazing sea.
Celebrity Ode
I shadow cast mirror the sea, the sea mirror left my heart.
White not forget themselves first, long Jiuzhaigou situation.
- Chen Light