赛里木湖古称“净海”，位于中国新疆维吾尔自治区博尔塔拉蒙古自治州博乐市境内的北天山山脉中，紧邻伊犁哈萨克自治州霍城县，是新疆海拔最高、面积最大的高山冷水湖，是大西洋暖湿气流最后到达地方，因此有“大西洋最后一滴眼泪”的说法。“赛里木”为哈萨克语音译，意为“祝愿（丝绸之路行人平安）”，也有蒙古语“山脊梁上的湖”音译之说。又名三台海子，因湖东岸的三台（即清代设立的鄂勒著依图博木军）而得名。
赛里木湖是7000万年前喜马拉雅造山运动产生的地堑湖。晚石炭世末期的因尼卡拉运动使得天山赛里木湖—博罗霍洛地区首先形成褶皱，再由第四纪的断块运动形成地洼断褶带山脉及断陷湖泊——赛里木湖。赛里木湖的湖水主要来自降水、冰川融水和地下水，据推测水源主要来自地下潜流。其湖盆中的第四纪湖泊沉积反映了西天山历史上的地质发育和冰川作用，为研究第四纪以来的气候和地质数据提供材料。
Sayram Lake also known as Santai Haizi (Chinese: 三台海子) or historically the "Clean Sea" (净海), is an endorheic freshwater lake in the northern Tianshan Mountains at Börtala Mongol Autonomous Prefecture, Xinjiang, China, less than 50 km (31 mi) from the border with Kazakhstan. The name Sayram originally derives from Kazakh, meaning "blessing".
The lake is the largest (458 km2 or 177 sq mi) and also the highest (at 2,070 m or 6,790 ft) alpine lake in Xinjiang, largely filled by glacial meltwater, residual precipitation from the Eurasian westerlies and runoffs from the surrounding mountain chains, as well as some groundwater springing and seepage. It is an AAAA National Scenic Area since 2010.
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