Wetlands are located all over earth. As mentioned earlier, wetlands need a water source to exist, and there are water sources all over this planet.
What kinds of wetlands do you think exist in very hot places like Africa?
http://www.nationalgeographic.com/adventure/0201/images/everglades/everglades_map.gif
http://www.worldwildlife.org/wildworld/profiles/terrestrial/nt/nt0904_full.html
