What are all the characteristic features of lagoons?

Shallow water bodies, with ca 2–4 m depth

Salinity may vary from 5 to 35 ppt (or zero to hypersaline) depending upon the freshwater in-flow

Support the lives of many plants and animals, especially the submerged macrophytes

Good breeding grounds and shelters for many marine fishes, shrimps, crabs, etc.

Usually they are surrounded by thick human population

They are the very good indicators of environmental degradation