Loyalhanna Lake is a man-made reservoir located in Westmoreland County, Pennsylvania. It was created by the U.S. Army Corps of Engineers in the 1970s to provide flood control, water supply, and recreational opportunities for the surrounding communities. The lake spans approximately 1,200 acres and offers various activities such as fishing, boating, and hiking. It is also home to diverse wildlife and provides a scenic environment for visitors. The surrounding area includes parks and trails, making it a popular destination for outdoor enthusiasts.