City Island

City Island is a neighborhood in the northeastern Bronx in New York City, located on an island of the same name approximately 1.5 miles (2.4 km) long by 0.5 miles (0.80 km) wide. City Island is located at the extreme western end of Long Island Sound, south of Pelham Bay and east of Eastchester Bay.At one time the island was incorporated within the boundaries of Pelham, Westchester County, New York, but the island is now part of New York City.

Public School 17 is a historic school located at City Island in the Bronx, New York City. It was designed by architect C. B. J. Snyder (1860–1945) and built in 1897 in the Neo-Georgian style. A rear addition was built in 1930. It is a two-story, five-bay brick building on a high basement. It features a shallow wooden entrance porch with Doric order columns.

Green Flats is a reef in City Island Harbor, between City Island and Rat Island. It is part of the Pelham Islands.The reef is composed of mostly small round glacial alluvial rocks and a number of glacial erratics made of granite. It is covered in green seamoss and kelp. Like all true reefs, it is completely underwater (and a hazard to navigation) at high tide and visible at low tide.