Take a tour of some of the lowest places on Earth

Learn about the geography and history behind some of the world's most challenging environments.

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Salt desert near lake Eyre South, Australia Salt desert near lake Eyre South, Australia (Photo: Alberto Loyo / Shutterstock)

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Lake Eyre, Australia: 52 feet below sea level

This salty lake is located in the central Australian desert. Surprisingly, it's rarely filled with water, creating the interesting, salt-covered landscape pictured here.

Its water levels depend on the region's annual monsoons and rainfall; the "lake" has only been filled to capacity three times in the last 150 years. But when it does fill up, it's a sight to behold. The air is filled with huge numbers of birds flocking to the area, and rich wildflowers and green foliage spring up everywhere, salty waters swirling in patterns to the horizon.

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