Adeline Jay Geo-Karis Illinois Beach State Park, part of the Illinois state park system, is located along Lake Michigan in Winthrop Harbor, Zion, Beach Park and unincorporated Benton Township in northeast Illinois. Together with lands to the north, including Chiwaukee Prairie, it forms the Chiwaukee Prairie Illinois Beach Lake Plain, an internationally recognized wet-land of importance under the Ramsar Convention. The park is broken into two units that encompass an area of 4,160 acres (1,683 ha) and contains over six miles of Lake Michigan shoreline. In 2010, it was renamed for former state senator Adeline Geo-Karis.