The Rahway River Parkway is a greenway of parkland along the banks the main stem Rahway River and its tributaries in Union County, New Jersey, United States. Created in the 1920s, it was one of the inaugural projects of the newly-created Union County Parks Commission. It was designed by the Olmsted Brothers firm, sons of landscape architect Frederick Law Olmsted. The Rahway River Greenway plan expands on the original design. Many of the crossings of the river are late 19th century or early 20th century bridges. The East Coast Greenway uses paths and roads along the parkway.

Springfield Township is a township in Union County, in the U.S. state of New Jersey. The township is located on a ridge in northern-central New Jersey, within the Raritan Valley and Rahway Valley regions in the New York metropolitan area. As of the 2020 United States census, the township's population was 17,178, the highest recorded at any decennial census, an increase of 1,361 (+8.6%) from the 2010 census count of 15,817, which in turn reflected an increase of 1,388 (+9.6%) from the 14,429 counted in the 2000 census.