“White Sand Lake” is the most common of many names given to the pictured place.
Some call it a lake, others call it a mountain.
The lake’s surface is circa 3,300 metres above sea level, on the Pamir Plateau.
It is adjacent to the Karakoram Highway, around 150 kilometres south of Kashgar city.
For this photo I deployed a telephoto lens; had I instead used a wide-angle one, you would be able to see that blue waters and big dunes comprise just one part of an epic, sweeping landscape which also features massive, snowcapped, stark, rocky mountains.
Eventually, a multi-image post will reveal much more.