The highest points of the Annamite Range are the -high
Phou Bia, the -high
Phu Xai Lai Leng and the -high
Ngọc Linh (Ngoc Pan). The latter is located at the northwestern edge of the
Triassic Kontum Massif in central Vietnam. Important
mountain passes are the Nape Pass and the
Mụ Giạ Pass. The Annamite Range runs parallel to the Vietnamese coast, in a gentle curve which
divides the
basin of the
Mekong River from Vietnam's narrow
coastal plain along the
South China Sea. Most of the crests are on the Laotian side. The eastern slope of the range rises steeply from the plain, drained by numerous short rivers. The western slope is more gentle, forming significant
plateaus before descending to the banks of the Mekong. The range itself has three main plateaus, from north to south: Phouane Plateau, Nakai Plateau and
Bolaven Plateau.
Laos lies mostly within the Mekong basin, west of the divide, although most of
Houaphan Province and a portion of
Xiangkhoang Province (where the famous
Plain of Jars is located) lie east of the divide. Most of Vietnam lies east of the divide, although Vietnam's
Tây Nguyên (Central Highlands) region lies west of the divide, in the Mekong basin. == Etymology ==