Here is a fascinating look at one of the most basic of food production processes: the harvesting of salt. The area shown is in the mangrove areas around the area of Petchburi in Central Thailand. It's part of the Samut Songkhram province, on the Gulf of Thailand just west of Bangkok. It's one of the major salt producing areas of Thailand. You can see the process from a bird's eye view in this video from contributor and drone pilot Grantthai.