Qarhan Lake is known for its vast salt reserves, which have been exploited for industrial purposes. Salt extraction from the lake is a significant economic activity in the region, and the lake’s salt deposits are estimated to be one of the largest in China.

The vast majority of the time, it appears white, blue, or even pink due to its salt deposits, mineral composition or the reflection of sunlight off the salt crust on its surface. However, during specific times of the year, particularly in autumn, it can take on a stunning emerald green hue.

The primary reason behind the green color is the presence of microscopic algae called Dunaliella Salina. These tiny organisms thrive in the lake’s salty environment and contain a green pigment called chlorophyll, similar to plants. When conditions are favorable, like during autumn when temperatures are mild and sunlight is sufficient, these algae experience rapid growth and bloom, painting the lake surface a vibrant green.

Several seasonal factors may contribute to the algae blooms. Autumn brings milder temperatures, creating a comfortable environment for the algae to flourish. Additionally, the decrease in rainfall during this period concentrates the salt content in the water, further promoting their growth.

Qarhan plays a significant role in China’s economy. The salt deposits here are rich in various minerals, including lithium, potassium, and magnesium, making it a valuable resource for industrial applications. The salt production industry thrives in the region, and the “Ten-Thousand-Foot Salt Bridge,” a 32-kilometer-long causeway built across the playa, facilitates transportation and extraction activities.

According to the Internet