Brooklyn is located on the westernmost point of Long Island and shares its only land boundary with Queens to the northeast. The westernmost section of this boundary is defined by Newtown Creek, which flows into the East River.
Brooklyn's waterfront faces different bodies of water. Northern Brooklyn's coast is defined by the East River, while middle Brooklyn adjoins Upper New York Bay. This area of the waterfront features the Red Hook peninsula and the Erie Basin. Buttermilk Channel separates this part of the waterfront from Governors Island. Southwest is Gowanus Bay, connected to the Gowanus Canal. At its south westernmost section, Brooklyn is separated from Staten Island by the Narrows, where Upper and Lower New York Bay meet.
The highest point in Brooklyn is the area around Prospect Park and Green-Wood Cemetery, rising approximately 200 feet above sea level. There is also a minor elevation in Downtown Brooklyn known as Brooklyn Heights.
According to the United States Census Bureau, the County has a total area of 251.0 km² (96.9 mi²). 182.9 km² (70.6 mi²) of it is land and 68.1 km² (26.3 mi²) of it is water. 27.13% of the total area is water.
Populations of wild Monk Parakeets, also known as the Quaker Parrot, live in Green-Wood Cemetery, Midwood, Marine Park, Bensonhurst, and Bay Ridge.