Kingston Fortifications National Historic Site is located in and around the harbour area of Kingston, Ontario. Situated at the mouth of the Cataraqui River, and overlooking the confluence of Lake Ontario and the St. Lawrence River, the fortifications consist of five separate 19th-century military installations, including Fort Henry National Historic Site of Canada (NHSC), Fort Frederick, part of the Point Frederick Buildings NHSC, the Murney Tower NHSC, Shoal Tower NHSC, and Cathcart Martello Tower. An inter-related defense system, the concentration and orientation of the limestone fortifications towards the water convey their essential purpose as a defensible platform for guns. Built between 1832 and 1840, the Kingston fortifications represent the apogee of smooth bore technology. Official recognition refers to the boundaries of each of these installations situated around the Kingston Harbour.
Individual sites operated privately.