Lake Jacksonville is a man-made reservoir located in Jacksonville, Illinois. It was created in the 1960s to provide a water supply for the city and to offer recreational opportunities for residents and visitors. The lake covers approximately 1,200 acres and features a variety of activities such as fishing, boating, and swimming. Surrounding the lake, there are several parks and picnic areas, making it a popular destination for families and outdoor enthusiasts. The lake is also home to various wildlife, including birds and fish, contributing to the area's natural beauty and ecological diversity.