It begins 400 km from Hanoi, where the massive Hoanh Its meets the sea, forming the door of Trung Bo, on the 18th degree of north latitude. It will end at about fifty miles from Saigon. Trung Bo is a land in any length, with the exception of regions corresponding to the northern provinces of Thanh Hoa and Nghe An Its average width reaches 120 km and the difficulty is reduced to 40 km up to Dong Hoi in the province Quang Binh. Guru has noticed that at this level, including the alluvial entered first foothills of the Truong Son chain and cord coastal dunes, only a few hundred meters. "She draw a convex curve of the sea coast and suggest an obese belly of Cape Varella do not be the navel" (Huard).
Cordillera Central, which forms the border with Laos, covers 600 km from northwest to southeast to the province of Quangnam-Danang, before giving way to the Highlands, composed of metamorphic rocks and volcanic. Cordillera rarely exceeds 1500 m, while its point culminat is 2 598m at Ngoc Linh.
Cordillera Central, which forms the border with Laos, covers 600 km from northwest to southeast to the province of Quangnam-Danang, before giving way to the Highlands, composed of metamorphic rocks and volcanic. Cordillera rarely exceeds 1500 m, while its point culminat is 2 598m at Ngoc Linh.
