The Northeast (Đông Bắc) is the region at the north of the Red River Delta, Vietnam. Northeast called to distinguish them from the Northwest, but it's actually in the north and northeast of Hanoi, wider than Việt Bắc. The northeast is one of three sub-regions of northern Vietnam (2 other sub-region is the Northwest and the Red River Delta). Sometimes the Northeast, including the Red River Delta. The northeast region encompasses the provinces northeast of Hanoi, near the border with China. It has a population of about ten million.
Geographical boundaries to the west of the Northeast is not clear. Mainly due to the lack of consensus among the geography of Vietnam on the boundary between the Northwest and Northeast to the Red River, or should the Hoàng Liên Sơn. The Northeast is limited to the north and east by Vietnam-China border. Southeast overlooking the Gulf of Tonkin. The southern limit by Tam Đảo mountain range and the Red River Delta. It is mountainous and midland with mountainous include massifs, limestone mountains, or mountains.
The western side, is limited by the Red River valley and the Chảy River's source, above, is composed of granite, slate and limestone plateau. In essence, this is the edge of the Yunnan Plateau. The high mountains of the Northeast are concentrated here, as Tây Côn Lĩnh, Kiêu Liêu Ti.
The northern part junction with Vietnam-China border are the plateau (highland) turns from west to east are: Bắc Hà, Quản Bạ, Đồng Văn. Two first plateau has an average elevation of 1000-1200m. Đồng Văn Plateau is 1600m. River and stream flowing through the plateau created a long and deep canyons. There are also some small plain, which is Thất Khê, Lạng Sơn, Lộc Bình, Cao Bằng.