What do you call a large area of flat land with gently rolling hills and few trees

I call it a desert because a desert has a flat land and a few trees which is only cactus

because mexico wanted to choose a centralized location

in which two ways were the northeast woodland indians and the southeast indians similar? both collaborated to form the iroquois confederacy. both cultivated the crops of corn, beans, and squash. both lived in rich environments of swamps and rivers. both lived in tree-bark dwellings called wigwams. both expected men to hunt, while women farmed.