I recently went to this place called Mandarmani. The are is severely under-mapped. When I look at the satellite images, its a complex maze of salt pans, paddy holdings, wetlands and water reservoirs for shrimp farming. Ideally each water tank should be drawn out. Any suggestions?
How about
water = salt for salty water, https://wiki.openstreetmap.org/wiki/Key:salt
or
https://wiki.openstreetmap.org/wiki/Tag:landuse%3Daquaculture with aquaculture = shrimp would imply that it is salt water.
There’s also landuse = salt _pond