The department is responsible for the operation and maintenance of 132 parks, 19 recreation centers, 25 swimming pools, 7 splash pads, three tennis centers, three urban fishing lakes, nature trails, sports fields, open space and undeveloped properties, special places and hundreds of programs, including large special events that are offered throughout the year. The City of Tucson is comprised of 236 square miles and has a population of 526,000 residents. The department also manages contracts with the nationally accredited Reid Park Zoo, five city-owned public golf courses, and the region's largest convention and event space, the Tucson Convention Center.