Imagine driving through the endless golden sand of the Tengger Desert, and suddenly seeing a bright red lake. This is Ulan Lake. People call it the "Heart of the Earth" or "Red Haizi." In the Mongolian language, Ulan means "Red." If you fly a drone above it, the lake looks exactly like a real human heart. It has a big red main lake and a few smaller red lakes around it, and the lake edge looks just like the shape of a heart. Ulan Lake in summer Why is it red? And how did it f