From Shandouping to Chongqing

214 landslides and collapses are distributed on the banks (the length is 600km) of the Yangtzi River Valley where Three Gorges Dam would be built. The area is more than 100km2 and the total volume is 13.52 million m3. There can be 0.36 land slide and collapse in 1.0km of the valley and the volume is 2.2532 million m3. Among 214 landslides and collapses

large or the largest ones (over 10 million m3) are 36. All of them are distributed at the banks of structure

the dipping ends of anticline and the raise ends of syncline

the composite sectors for crossing a few structure line groups

the strong uplifted area for neotectonics and the borders of the structure basin. The destructive ways of the valley and bankslope: the bedding landslide are main; the dissecting landslides are less; and then there loose accumulational landslides of the Quaternary Period occupy 20% of the total volum

the collapses are only about 8%. These landslides and collapses

especially large or the largest landslides are distributed in vital part of reservoir area and will endanger the security of Three Gorges Dam or even the whole of the reservoir.