长海海拔3060米，最高处4457米，座落在则查洼沟的尽头，海拔3100米，宽约600多米，湖最深处达百余米，是九寨沟湖面最宽阔、湖水最深的海子。
　　 长海四周没有出水口，水源来自于高山融雪。厅怪的是，长海从不会干涸，也不会溢堤，因此藏民称之为“装不满，漏不干”的宝葫芦。
　　 长海呈墨蓝色，四周山峦叠翠，对面的群峰，一到初秋便披上白色的盔甲，中间一座冰峰寒光逼人。北侧入口和湖岸有一棵独臂老人松，造型奇特，一侧枝叶横生，另一侧则秃如刀削。
　　 欣赏长海可由入口的左侧一条向左分贫的小路进入，转到长海的侧面观赏。这里巨松挺拔，满目碧绿，彩叶成林。
　　 冬天长湖面结冰，是一个银色的童话世界，此时，长海成了天然冰上游乐场，游人可在此尽兴溜冰、跑马。
　　　 　　　 名人题咏

　　　　　　　 长海滩头一古松，半面残枝斗霜风。
　　　　　　　 生成傲骨不低头，自与杂木两不同。
　　　　　　　　　　　　　 　　　 ——任成文《长海古松》

Altitude of 3060 m long sea, the highest point 4457 meters, is located in Zechawagou the end of the elevation of 3,100 meters and a width of more than 600 meters, the deepest lake hundred meters, is the most wide lake in Jiuzhaigou, the deepest lake Hai Zi.
Not long sea around the outlet, water from mountain snowmelt. Office of strange, long sea never dry up, it will not overflow dike, so the Tibetans call "not fill, drain or quitting," the Magic Gourd.
Long sea were ink blue, surrounded by chain of mountains, across the peaks, to the early autumn they put on a white helmet in the middle of a Bingfeng Hanguang pressing. North shore of the entrance and armed with an old song, strange shape, a lateral branch Ye Hengsheng the other side of the bald as sliced.
Appreciate the long sea by the entrance to the left of a lane into the left sub-poverty, go to the long side of the sea view. Here Ju Song upright, green everywhere, color Yecheng Lin.
Long lake ice in winter is a silver fairy-tale world, this time, a long sea ice has become a natural playground, visitors can have fun in this ice skating, horse racing.
Celebrity Ode

Long Beach head an old pines, half of a broken bucket Shuangfeng.
Generated proud and do not bow, with trees and foliage from two different.
- Ren Chengwen "long Haigu Song"