在大凌河干流有座水库叫白石水库,可控制流域面积17649平方公里,是辽西第一辽宁第三大水库。周边湿地,地处大凌河与牛河交汇处,湿地面积为90平方公里,为东北亚候鸟迁徙路线中的重要栖息地,每年大约有400万只候鸟经此路线迁徙。每年的春季和11月份,大批天鹅从南方迁徙到这里落脚觅食,在此逗留长达2个月之久,壮观的天鹅群吸引了众多摄影爱好者 There is a reservoir in the main stream of Daling River, called Baishi Reservoir, which can control the drainage area of ​​17,649 square kilometers and is the third largest reservoir in Liaoning Province. The surrounding wetlands, located at the confluence of the Daling and Niuhe rivers, cover an area of ​​90 square kilometers and serve as an important habitat for the migratory routes of northeast Asian migratory birds. About 4 million migratory birds migrate this route annually. Each spring and November, a large number of swans migrate from the south to settle here for food, staying here for up to 2 months, and the spectacular swan group has attracted many photographers