Dhaka, Jan. 22 -- The Siwa Salt Lakes in Egypt's Siwa Oasis are known for their striking turquoise water and for a rare experience: in many of the pools, it is extremely difficult to sink. Unlike some viral travel locations that disappoint in real life, these desert pools often look much like the photos shared online.

Located near Egypt's border with Libya, the pools are shaped by the area's geology and by salt extraction. As minerals are excavated from dried salt lakes, some basins later fill naturally with water from underground springs. In the intense desert climate, water evaporates quickly, leaving behind very high concentrations of mineral salts. That salinity makes the water denser, creating strong buoyancy, so swimmers tend to fl...