湖盆由构造运动形成，湖盆位于藏南谷地保留完好的古高原夷平面上。南北长23.5公里，东西最大宽度10.8公里，岸线周长148公里 。湖泊整体呈宝葫芦形或哑铃型，中间窄，两端宽 。湖区三面环山，地形开阔。湖水位自20世纪70年代以来下降5米，湖面面积缩减超过10平方公里 。湖岸发育古湖岸线地貌，东北岸可见六级阶梯状台地，最高古湖岸线高于现湖面70米。
东南岸观景台可同时观测佩枯错全景与希夏邦马峰倒影，岗彭庆峰（海拔7284米）与佩枯岗日峰群（海拔超6000米）构成环湖雪山景观。湖西岸有狭长半岛伸入湖心，将湖面分割为南大北小两部分。湖心岛高出水面30多米，向湖心延伸出500多米，岛顶是佩枯错雪山倒影的最佳观景点。此外，拉普村因能同时观赏佩枯错与希夏邦马峰同框，成为受欢迎的摄影和观景点 。
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| 喜马拉雅山脉中段的希夏邦马峰（Shishapangma）延伸山系。 |
Lake Pelku or Paiku (Chinese: 佩枯错) is a lake at 4,591 meters (15,062 ft) elevation on the Tibetan Plateau in Shigatse Prefecture. It is 18 kilometers (11 mi) south of the Yarlung Tsangpo (Brahmaputra) River, bordering Saga County, Gyirong County, and Nyalam County.
Lake Paiku is 27 kilometers (17 mi) long and 6 kilometers (3.7 mi) wide at its narrowest. It is surrounded by mountains reaching 5,700 to 6,000 meters (18,700 to 19,700 ft). Streams fed by glaciers cascade to the valley floor, but most sink into alluvial deposits before reaching the lake.
The surrounding catchment is an endorheic basin with no outlet. It would overflow into the Yarlung Tsangpo with a water level about 100 meters (330 ft) higher. The lake's brackish water is evidence that it has not overflowed in hundreds, if not thousands, of years.
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| 喜马拉雅山脉中段的希夏邦马峰（Shishapangma）延伸山系。 |
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| Day 4 |
