A survey by the COA of the collapsed areas of watersheds where landslides tend to occur revealed that Taiwan has some 458 waterways which are prone to landslides. These waterways flow through 19 counties and major metropolitan areas as well as more than 1000 towns and villages.
經農委會坍塌危域調查，全台灣有四百八十五處易造成土石流災害的溪流，並流經十九個縣市、一千多個地區，其中以花蓮、台東、南投最為嚴重。