Xiangkhoang Plateau

French  Plateau de Xiangkhoang , formerly  Plateau du Tranninh , English  Tran Ninh Plateau  dissected upland of complex geologic structure in north-central Laos. The plateau constitutes a western extension of the northern Annamite Chain; it is drained principally by the Ngum and Ngiap (Nhiêp) rivers to the south and the Khan River to the north, all of which are Mekong River tributaries. Once the upland's limestone and sandstone hills were covered with tropical