The smooth surface of the shallow water covering this huge salt flat in Bolivia acts like a giant mirror. Tourists travel to the Salar de Uyuni to see the effect and walk out into the lake. Now scientists have used satellite data and on-the-ground measurements to determine exactly how flat the surface of the water is – but how it stays so smooth is still a mystery. | Nature

83K views · 2.7K reactions | The Bonneville Salt Flats, comprised of mostly sodium chloride that forms a hard, white salt crust and home to numerous land speed records, is covered in nine inches of water, forming a shallow lake on Friday, Jan. 27, 2023. With nowhere for the rain and snow melt to go, precipitation slowly evaporates throughout the year to restore the flat's delicate salt layer. | The Salt Lake Tribune | Facebook