The Cleveland Metroparks Zoo is a 183-acre (74 ha) zoo in Cleveland, Ohio. The Zoo is divided into several areas: Australian Adventure; African Savanna; Northern Trek; The Primate, Cat & Aquatics Building; The RainForest; and Waterfowl Lake. Cleveland Metroparks Zoo has one of the largest collections of primates in North America, and features Monkey Island, a concrete island on which a large population of colobus monkeys are kept in free-range conditions (without cages or walls).