The Wulan Lake in the hinterland of the Tengger Desert, Alxa Left Banner, Inner Mongolia, has not been developed because it is rarely known by people.

The bright red lake water has flowed like blood on the surface for hundreds of years, and the shape of the lake surface is like a beating heart imprinted on the earth.

The glint of the sun on Wulan Lake dazzles on the remote desert of Alxa League in north China's Inner Mongolia Autonomous Region, August 29, 2021. /CFP

The agate red lake is also known as "the heart of the Earth". /CFP

It turns pink and red because of the enormous upsurge in red algae found in the salt lake that dried up in 1995. /CFP