重点流域 meaning in English

major drainage area
major river valley

Key ecological projects undertaken to prevent and control pollution in the basins of the huai river , tai lake and other major rivers and lakes , protect virgin forests , return farmland to forests or grassland , and prevent and control desertification
去年投入国债资金亿元，主要用于淮河太湖等重点流域污染防治和天然林保护退耕还林还草防沙治沙等重点生态工程。
We worked hard to prevent and control water pollution in key river valleys and regions , such as the three gorges reservoir area , the songhua river , the sources and routes of the south - to - north water diversion project , and the bohai sea . we carried out key environmental protection projects to desulphurize emissions from coal - fired power plants , treat urban sewage and dispose of waste safely
积极推进重点行业重点企业和重点工程的节能工作，开展循环经济试点，加强三峡库区松花江南水北调水源及沿线渤海等重点流域和区域水污染防治工作，实施燃煤电厂脱硫城市污水处理垃圾无害化处理等环保重点工程。