Franklin Park, a partially wooded 527-acre (2.13 km2) parkland in the Jamaica Plain, Roxbury, and Dorchester neighborhoods of Boston, Massachusetts, is maintained by the City of Boston Parks and Recreation Department. It is Boston's biggest park and the site of Franklin Park Zoo. Considered a country park when it was formed in the 19th century, Franklin Park is the largest and last component of the Emerald Necklace created by Frederick Law Olmsted. Although often neglected in the past, it is considered the "crown jewel" of Olmsted's work in Greater Boston. Much of Franklin Park is scenic and devoted to the general use and enjoyment of the public. Scarboro Pond and Ellicott Arch are popular sites within the park, as are the large forested areas. The park also has picnic areas, stone bridges, outcroppings of Roxbury Puddingstone, and old stone ruins, specifically the Long Crouch Woods of Roxbury—also known as "the Bear Dens."