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小江,发源于滇东高原鱼味后山,长138公里,流域面积3043平方公里,流经寻甸县、东川市和会泽县境。小江从南向北纵贯东川,将境内分为东西两部分,西部为拱王山,东部为乌蒙山脉,两山主峰海拔均在4000米以上,地势由西向东下降,从南向北倾斜,高差达3600余米。由于受地质内外营力作用,山体岩石破碎,裂隙众多,不良地质现象发育,加之人类工程——经济活动的强度大大超过了山地承载力和调整能力,
Small river, originated in the Yunnan plateau fish mountain, 138 km long, the basin area of 3043 square kilometers, flows through Xundian County, Dongchuan City and Huize County. Xiaojiang runs through Dongchuan from south to north and divides the territory into two parts: the arch king and the west, the Wumeng Mountain in the east, and the peak elevation of the two mountains above 4,000 meters. The terrain descends from west to east and from south to north Tilt, height difference of 3600 meters. Due to the geological and geological forces inside and outside the camp, rock fragmentation, numerous cracks and unfavorable geological phenomena, combined with human engineering - the intensity of economic activity greatly exceeds the carrying capacity and adjustment capacity of the mountain,