Introduction The United States is famous for its innumerable lakes like Superior, Huron, and Michigan. However, travel folders rarely mention all the four unique wetlands that dot vast portions of the land. What are the four types of wetlands? They are marshes, swamps, bogs, and fens. Unfortunately, some people use these terms interchangeably since they don’t know this. These wetlands have several unique characteristics that curious readers and environmentalists can’t afford to miss.