WORLD HISTORY

Detailed explanation-1: -At more than 42 million acres, the Pantanal is the largest tropical wetland and one of the most pristine in the world. It sprawls across three South American countries-Bolivia, Brazil and Paraguay-and supports millions of people there, as well as communities in the lower Rio de la Plata Basin.

Detailed explanation-2: -The water of a swamp may be fresh water, brackish water, or seawater. Freshwater swamps form along large rivers or lakes where they are critically dependent upon rainwater and seasonal flooding to maintain natural water level fluctuations.

Detailed explanation-3: -swamp, type of wetland ecosystem characterized by mineral soils with poor drainage and by plant life dominated by trees. The latter characteristic distinguishes a swamp from a marsh, in which plant life consists largely of grasses. Swamps are found throughout the world.