Sunfish Pond is a 44-acre (18 ha) glacial lake surrounded by a 258-acre (104 ha) hardwood forest located on the Kittatinny Ridge within Worthington State Forest, adjacent to the Delaware Water Gap National Recreation Area in Warren County, New Jersey. The Appalachian Trail runs alongside the western and northern edges of the lake. It was created by the Wisconsin Glacier during the last ice age. The lake was declared a National Natural Landmark in January 1970.