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Valleys and valleys, with long and narrow negative terrain on both sides, often have slope runoff, rivers and lakes. The steep valleys may have mudslides, which are represented by a group of elevations on the contour map. contour line. Tonggu: It means that there are two rivers separated by watersheds. After the rivers are captured, they form a continuous valley. Valley: refers to a small valley, with hills or hills on either side, and terrain formed by springs or streams in the middle; such terrain is distributed in hills and low hills, and is often represented by small hillside terrain. Often used as a description of the terrain in a small area. Valley: The terrain consisting of mountains or mountains on both sides and rivers in the middle. The valleys are mostly located in hills and mountainous areas. The valley topography constitutes a “river valley plain”. The terrain of the river valley plain is relatively flat, and the river flow in the middle is gentle.