The green-brown waters of Lake Barkol sit within the pale shorelines of an ancient lake, hinting that the climate was once much wetter in this part of western China.
A rim of crystal salts surrounds Lake Qarhan, the largest salt lake playa in China and a significant source of minerals, including table salt and potassium for fertilizer.
At the juncture of the border between China and Russia sits Lake Khanka, also known as Lake Xinghai. Due to their importance to plant and animal species, the lake and the surrounding wetlands are protected by the Ramsar Convention, an international treaty for the protection and sustainable use of wetlands. Migratory birds that frequent this lake include several endangered species, such as the Japanese crane.
Lake Titicaca, at an elevation of 12,507 feet (3,812 meters) in the Andean Altiplano, is the highest large lake in the world. More than 120 miles long and 50 miles wide, it was the center of the Incan civilization, and today straddles the boundary between Peru and Bolivia.
Great Salt Lake serves as a striking visual marker for astronauts orbiting over North America. A sharp line across its center is caused by the restriction in water flow from the railroad causeway. The eye-catching colors of the lake stem from the fact that Great Salt Lake is hypersaline, typically 3–5 times saltier than the ocean, and the high salinities support sets of plants and animals that affect the light-absorbing qualities of the water. Space Station astronauts have recorded the decline in lake levels in response to a regional 5-year drought taking both detailed views and broad views of the entire lake. As lake levels have declined the salt works have become islands in the middle of a dry lakebed.
Searles Lake is known for the abundance of rare elements and evaporate minerals, such as trona, hanksite, and halite formed within its sediments. Evaporites are minerals that are left behind when saltwater evaporates. This astronaut photograph depicts the Searles Lake playa (characterized by white surface mineral deposits) bounded by the Argus and Slate Mountains. The width of the playa is approximately 10 kilometers. The center of the image is dominated by mining operations that extract sodium- and potassium-rich minerals (primarily borax and salt) for industrial use.
The Venezuelan government declared a state of emergency in mid-June to remove the fast-growing weed, spending about $2 million per month on clean-up efforts.