borderland: district consisting of the area on either side of a border or boundary of a country or an area
district: a region marked off for administrative or other purposes
magnoliidae: a group of families of trees and shrubs and herbs having well-developed perianths and apocarpous ovaries and generally regarded as the most primitive extant flowering plants; contains 36 families including Magnoliaceae and Ranunculaceae; sometimes classified as a superorder