3月22日拍摄的丹江口水库（无人机照片）。
有“亚洲第一大人工湖”之称的丹江口水库，是南水北调中线工程的水源区。2014年12月12日，南水北调中线工程全面通水；9年来，累计调水量已超过600亿立方米，豫冀津京四省市直接受益人口超过1.08亿人。监测数据显示，丹江口水库常年稳定保持在Ⅱ类及以上水质。
新华社记者 肖艺九 摄
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