Often, wetlands. land that has a wet and spongy soil, as a marsh, swamp, or bog.

1770–80; wet + -land

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World English Dictionary
wetland (ˈwɛtlənd)
(sometimes plural)
 a.  an area of swampy or marshy land, esp considered as part of an ecological system
 b.  (as modifier): wetland species

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1743, from wet (adj.) + land (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
wetland  [%PREMIUM_LINK%]     (wět'lānd')  Pronunciation Key 
A low-lying area of land that is saturated with moisture, especially when regarded as the natural habitat of wildlife. Marshes, swamps, and bogs are examples of wetlands. See more at lacustrine, marine, palustrine, riverine.

Our Living Language  : Wetlands are areas such as swamps, bogs, and marshes where water either covers the soil or is present at or near the surface, particularly in the root zone, at least a good portion of the year, including the growing season. In the past, wetlands were generally considered unproductive or undesirable lands—smelly and unhealthful, a breeding ground for mosquitoes and other pests—and many were filled in to create farmland or to develop land for housing and industrial use. More than half of the original wetlands in the continental United States have disappeared in the name of reclamation, disease prevention, and flood control. Scientists now realize that, far from being noxious barrens, wetlands play a key role in the ecosystem. They act as filters, removing pollutants, including metals, from waters. They serve as reservoirs, and they aid flood and erosion control by absorbing excess water. Wetlands are home to a great variety of plant and animal species, some endangered, that have evolved to live in the wetland's unique conditions. The preservation and, where possible, restoration of these vital habitats has become a primary goal of environmentalists around the world.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
For a few months it is wetlands and is protected as a wildlife reserve.
The house included constructed wetlands and food gardens to filter water coming
  from the house.
It has devastated twenty-four thousand acres of wetlands, replacing them with
  open water.
Sparkles of light dance off a lagoon, and snowy herons glide over the wetlands.
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