This is a picture of potash pond in Moab, Utah. From the geometric shape of the pond, it is clear that it is man-made. The pond is used to produce potash, which has potassium that is useful as fertilizers. The blue color is due to dye to retain heat from sun and the different shades is due to different level of evaporation (the second picture). At the middle top of the first picture, there is a white and brown smudge which is where the activity of potash mining is done. The potash is mined by dissolving it in brine and then pumped to the potash pond to evaporate the brine and potash mixture to obtain pure potash.
Relevant website:
https://gizmodo.com/why-theres-an-electric-blue-lake-in-the-middle-of-the-u-1596118092
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