Hoh Xil, located in the northeastern Qinghai-Tibet Plateau, is China's largest uninhabited area and a UNESCO World Heritage Site since 2017. Spanning 45,000 km² at 4,600m average elevation, this "Land of the Beautiful Girl" (Mongolian meaning) features extreme cold (-46°C winters), glacial lakes, and unique biodiversity including 60,000+ Tibetan antelopes—a conservation success story against poaching.