Arthur Head (also known as Arthur's Head) in Fremantle, Western Australia, is a former large limestone headland on the southern side of the mouth of the Swan River, now also the entry to Fremantle Harbour. Historian Bob Reece identifies the geographical prominence of the location in his entry in the Historical Encyclopedia of Western Australia: Fremantle is a narrow peninsula of land located at the estuary of the Swan River within Cockburn Sound, its principal landmarks from the sea being the limestone outcrop known as Arthur Head and the two hills known as Buckland Hill and Monument Hill