Located in the heart of Illinois' largest concentration of natural lakes, Chain O Lakes State Park is a water oriented recreation area with outstanding opportunities for boaters, anglers and skiers. The park borders three natural lakes - Grass, Marie and Nippersink - and the Fox River that connects the other seven lakes (Bluff, Fox, Pistakee, Channel, Petite, Catherine and Redhead) that make up the Chain. In addition, the park contains a 44-acre lake within its boundaries. The 2,793 acre state park and adjoining 3,230 acre conservation area are located in the northeastern corner of Illinois in both McHenry and Lake counties. The park is 60 miles northwest of Chicago, 20 miles west of Lake Michigan and only 4 miles south of the Illinois/Wisconsin border. With nearly 6,500 acres of water and 488 miles of shoreline on the chain, Chain O Lakes State Park is the heart of water wonderland.
This was beautiful terrain. We're not super athletic and are more used to flat terrain in the suburbs of Chicago. I see the reviews mention easy but actually for us the hills gave us a good run for the money (a bit challenging and a fantastic workout). Very scenic, some trails rough gravel but most are good compacted crushed limestone.