Test and analysis: "Jiuqu Ileum" means river bend, and "Linhai Xueyuan" means forest landscape in cold zone. "River of no return" refers to the flow direction of the river from west to east, and "thousands of valleys and valleys" refers to the crisscross of the surface gullies. "Smooth water flow" means low terrain and slow water flow, and "endless" means vast territory. "River head" refers to the upstream birthplace of the river, and "river tail" refers to the downstream area of the river. "All the mountains are in the north" means that the mountains are high in the north, and "All the rivers are in the south" means that the rivers flow southward under the influence of topography. According to the words in the poem, it can be concluded that the geographical feature is the topographic feature of Indo-China Peninsula in Southeast Asia: mountains and rivers alternate with each other, showing a columnar distribution. Therefore, D is the right choice.
Comments: "Hetou" refers to the upstream birthplace of the river, and "Hewei" refers to the downstream area of the river. "All the mountains are in the north" means that the mountains are high in the north, and "All the rivers are in the south" means that the rivers flow southward under the influence of topography. According to the words in the poem, it can be concluded that the geographical feature is the topographic feature of Indo-China Peninsula in Southeast Asia: mountains and rivers alternate with each other, showing a columnar distribution. "Jiuqu Ileum" means Hequ, and "Linhai Xueyuan" means forest landscape in cold zone. "River of no return" refers to the flow direction of the river from west to east, and "thousands of valleys and valleys" refers to the crisscross of the surface gullies. "Smooth water flow" means low terrain and slow water flow, and "endless" is the characteristic of vast territory. Therefore, this topic describes the characteristics of language from the perspective of natural geography and grasps the topographic characteristics of Indo-China Peninsula in Southeast Asia.