The topic of wetlands has become a major issue for both environmentalists and politicians. It is probably also a major issue for migratory birds, baby fish, and amphibians, but their opinions are rarely taken into account by the people who are busy making changes in the environment.
Wetlands can contain freshwater or sea water.
Many inland wetlands are connected to streams, rivers, and lakes. During times of heavy rains, wetlands retain floodwaters. In addition to flood control, wetlands serve many natural purposes. They filter off toxic chemicals. Where fresh water meets salt water a marshy area called an estuary is formed.