pantanal
A marsh (a broad, flat area with pools of water and trees) in the Pantanal region of South America.
To the west the savannahs extend as far as the affluents of the Paraguay and Madeira. Here, as on the coast, we come again to primeval forests, the 'pantanals,' of a tropical luxuriance, which, like the forests of Hylæa, owe their peculiarities to running water. To the south of these the plains of Gran-Chaco, and the woody highland of Paraguay, alternating with open grass[…]
Where it comes from
Portuguese pantanal, in Bolivia and Paraguay probably via Spanish.
Adapted from the Wiktionary entry pantanal (CC BY-SA 4.0).