The Amazon grassland lies at the tip of what was once South America. In the Amazon basin, the extensive rainforests are now reduced to a few tiny pockets, surrounded by extensive areas of tall grass savannah with scattered trees.
Rainfall is low, and the Amazon river has dwindled.
In these dry conditions there are frequent bushfires, triggered by lightning or the Sun. The fires cover huge areas at great speed.
Grasses rapidly recover from these fires; slow-growing trees are few.