Here's a breakdown:

* Wetland: An area of land that is saturated with water, either permanently or seasonally.

* Subtropical swamp: A type of wetland characterized by:

* Warm temperatures year-round

* High rainfall

* Dominated by grasses and other water-tolerant plants

* Slow-moving, shallow water

The Everglades is a unique and important ecosystem, often called a "river of grass" due to its vast expanses of sawgrass. It's a critical habitat for numerous species of plants and animals, including endangered species like the Florida panther and the American crocodile.