Melvern Lake is a large reservoir located in Osage County, Kansas. It was created by the construction of the Melvern Dam on the Marais des Cygnes River and covers approximately 6,200 acres. The lake is popular for various recreational activities, including fishing, boating, and camping. The surrounding area features several parks, such as Melvern Lake State Park, which offers amenities like picnic areas, hiking trails, and wildlife viewing opportunities. The lake is home to various fish species, making it a favored spot for anglers. Additionally, it serves as a habitat for numerous bird species, enhancing its ecological significance.