Looking like a black & white negative in the morning mist these are the Qilian Shan mountains in Qinghai Province from 30,000 feet up. The city of Xining is just visible by the plume of steam centre left. The snow covered Amne Machin mountain range in the distance is on the Tibetan Plateau and are the eastern extent of the Kunlun Mountains.

The river in view is the Huanshi River but the mist in the half distance outlines the horshoe curve of the Huang He, Yellow River, valley

We were on KLM flight KL891, Amsterdam to Chengdu.