*Terrain: Dense forests in northern regions including Amazon Basin; semiarid along northeast coast; mountains, hills, and rolling plains in the southwest, including Mato Grosso; midwestern savannahs; the world's largest wetland area; and coastal lowland. | *Terrain: Dense forests in northern regions including Amazon Basin; semiarid along northeast coast; mountains, hills, and rolling plains in the southwest, including Mato Grosso; midwestern savannahs; the world's largest wetland area; and coastal lowland. |