In nature, mountains and plateaus are the most watershed areas. The ridge line of watershed is called watershed line, which is the dividing line between adjacent watersheds, and is generally the connecting line of the highest point of watershed. According to morphology, it can be divided into two categories: symmetric watershed and asymmetric watershed. The watershed line of the symmetrical watershed is located in the center of the watershed, and the slopes on both sides have the same steps and lengths. The watershed line of the asymmetric watershed is biased to one side of the watershed, and the slopes on both sides are asymmetric. In nature, symmetric watershed is extremely rare, while asymmetric watershed is widely developed.
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The Great Watershed is the general name for the mountains and plateaus in the eastern part of Australia and the northern part of New South Wales. It is located in the northern part of New South Wales, roughly parallel to the coastline. It stretches about 3000 kilometers from Cape York Peninsula to Victoria, with a width of about 160km ~ 320km. Its highest peak, Kosiasco Mountain, is 2230 meters above sea level, which is the highest point in China. Rivers originating in the west flow into the Gulf of Carpentaria and the Indian Ocean, while rivers originating in the east flow into the Coral Sea and tasman sea in the Pacific Ocean.
The great watershed runs from north to south and runs through eastern Australia. Its northern part belongs to tropical climate zone, its central part belongs to subtropical climate zone and its southern part belongs to temperate climate zone. This long mountain system is like a natural barrier, blocking the warm and humid air from the Pacific Ocean, making the precipitation on the east and west slopes of the mountain very different, and the growing plants are also very different.
Dongpo has steep terrain, long and narrow coastal plains, abundant precipitation and diverse forest types. The west slope is gentle and inclined, and gradually expands westward into the central plain with little rainfall and drought for many years, showing a scene of grassland short irrigation.