Diamond Valley Lake is a large reservoir located in Riverside County, California. It was created in the late 1990s to provide water storage and supply for the region. The lake covers approximately 4,500 acres and has a capacity of about 260,000 acre-feet of water, making it one of the largest reservoirs in Southern California. The area surrounding Diamond Valley Lake offers various recreational activities, including fishing, boating, and hiking. The lake is also home to diverse wildlife and serves as an important habitat for local species. Visitors can enjoy scenic views and participate in outdoor activities while appreciating the natural beauty of the San Jacinto Mountains.