Mount Loretto Unique Area is a 194-acre (0.79 sq km) open space reserve and nature preserve administered by the New York State Department of Environmental Conservation on Staten Island, New York. Mount Loretto has approximately one mile of shoreline fronting Prince's Bay and Raritan Bay.
Along the shoreline are the highest ocean-facing bluffs in New York State, which reach a height of 75 feet (23 m). The bluffs are part of a terminal moraine (deposits of clay and gravel deposited during periods of glaciation); they are remnants left by the Wisconsin Glacier, which reached its southernmost terminus in Staten Island. The highest bluff is the location of an historic lighthouse the Princes Bay Light.
The stone lighthouse, which was built in 1864 with an attached lighthouse keeper's cottage built in 1868, is a New York State Landmark. Across from the park is the Church of St. Joachim and St. Anne, used as a set for the exterior church views in the film The Godfather. Within the preserve in addition to the bluffs there are extensive brackish and freshwater wetlands including a large vernal pond.
The preserve contains a wide variety of native plants, shrubs and trees owing to the diverse habitats represented within the park.
There are various species of birds which frequent the park during various parts of the year. It's large mowed fields make it attractive to many species of upland shorebird such as Buff-breasted Sandpiper and Upland Sandpiper. Other field birds such as Eastern Meadowlark and Bobolink can also be found here during migration. The wetlands areas support habitat utilized by various species of waterfowl such as the Wood duck (Aix sponsa).
Blue and Green-Winged Teal, as well many many species of ducks, waders and marsh birds. Many rare birds have visited the preserve including White Ibis, Scissor-tailed Flycatcher and Western Kingbird. The preserve is also home to snakes, turtles frogs and toads, as well as raccoons, chipmunks, moles and field mice.