Cleveland Metroparks is an extensive system of nature preserves in Greater Cleveland, Ohio. Eighteen reservations, which largely encircle the city of Cleveland, follow along the shore of Lake Erie and the rivers and creeks that flow through the region. Referred to unofficially as the 'Emerald Necklace', the network of parks spans over 25,000 acres (10,000 ha) and includes over 300 miles (480 km) of walking, bicycle, and horse trails as well as numerous picnic areas, nature education centers, golf courses, and countless fishing spots. In addition, the district includes the zoo in Cleveland. Four of the reservations are adjacent to Cuyahoga Valley National Park.

The Cleveland metropolitan area, or Greater Cleveland as it is more commonly known, is the metropolitan area surrounding the city of Cleveland in Northeast Ohio, United States. According to the 2020 census results, the six-county Cleveland, OH Metropolitan Statistical Area (MSA) consists of Cuyahoga County, Ashtabula County, Geauga County, Lake County, Lorain County, and Medina County, and has a population of 2,185,825, making it the 33rd-most populous metropolitan area in the United States and the third largest metropolitan area in Ohio. The metro area is also part of the larger Cleveland–Akron–Canton Combined Statistical Area with a population of over 3.7 million people, the most populous statistical area in Ohio and the 17th most populous in the United States.