East from Yangkiang, the region stretching westward to border of the FrenchIndo-China, including Luichow Penninsular and Hainan Island is the objective ofphysiognipnical studies of this paper. The author divides the region into three units: East from Yangkiang, the region stretching westward to border of the FrenchIndo-China, including Luichow Penninsular and Hainan Island is the objective ofphysiognipnical studies of this paper. The author divides the region into three units: