Jamaica Pond is a kettle pond, part of the Emerald Necklace of parks in Boston designed by Frederick Law Olmsted. The pond and park are in the Jamaica Plain neighborhood of Boston, close to the border of Brookline. It is the source of the Muddy River, which drains into the lower Charles River.USGS 2005The pond has an area of about 68 acres (28 ha), and is 53 feet (16 m) deep at its center (MassWildlife map), making it the largest body of fresh water in Boston, and the largest natural freshwater body in the lower Charles River watershed.