Socotra: Salt Hole/Meteor Crater
Socotra is full of incredible and unusual natural wonders and one of them is the so-called Salt Hole. This is actually an impact meteor crater that filled up with water. High temps and dry climate evaporate the water quickly leaving salt on the bottom and local people have been using the Salt Hole for salt extraction for many years. There are smaller evaporation holes with salt rims at the edges of the crater, that people built to create mini-salt pools.