Don Juan Pond - Photo by Pierre Roudier

At four inches deep, Don Juan Pond looks more akin to an oversized puddle of thick, briny liquid than a proper pond. Don Juan Pond is the saltiest of the Antarctic lakes and even has a 1.3 times greater salinity than the Dead Sea.The shallow water is so saturated with salt it remains liquid even when the temperatures plummet far below zero degrees. (South Fork, Upper Wright Valley, Antarctica)