Northeast, Northwest and Central Vietnam is mountainous and midland regions include many mountains, massif, plateaus and hills. It is inhabited by many ethnic minority groups. Big mountains here are the Hoang Lien Son in the north and in the central Truong Son. Many mountains with elevations over 2,000 meters, including Mount Fansipan highest, up to 3,143 meters. In the Northeast and Central regions, many mountain ranges run to the sea, forming a magnificent natural landscapes, majestic Red River Delta is a triangular region, an area of 15,000 square kilometers, slightly smaller but crowded more people in the Mekong River delta. In the past it was a small bay of the Gulf of Tonkin, it gradually deposited by sediment deposition giant rivers of the Red River system and Thai Binh river system, causing thousands of years each extended their year about a hundred meters out to sea. It is inhabited by ancestors of the Vietnamese. Before 1975, the Red River Delta accounted for 70% of agricultural output and 80% of industrial output in northern Vietnam.
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