Wikipedia: Washington heights, Manhattan
Washington Heights is a New York City neighborhood in the northern reaches of the borough of Manhattan. It is named for Fort Washington, a fortification constructed by Continental Army troops during the American Revolutionary War at the highest point on Manhattan island to defend the area from the British forces. During the Battle of Fort Washington, on November 16, 1776, the fort was captured by the British at great cost to the American forces; 130 soldiers were killed or wounded, and an additional 2,700 captured and held as prisoners, many of whom died on prison ships anchored in New York Harbor. The progress of the battle is marked by a series of bronze plaques along Broadway.
Washington Heights is on the high ridge in Upper Manhattan that rises steeply north of the narrow valley that carries 125th Street to the former ferry landing on the Hudson River. Though the neighborhood was once considered to run as far south as 125th Street, modern usage defines the neighborhood as running north from Harlem (Hamilton Heights) at 155th Street to Inwood, topping out just below Dyckman Street.
Wikipedia: Inwood, Manhattan
Inwood is the northernmost neighborhood on Manhattan Island in the New York City borough of Manhattan.
Inwood is physically bounded by the Harlem River to the north and east, and the Hudson River to the west. It extends southward to Fort Tryon Park and Dyckman St. Inwood is almost entirely defined by the 10034 postal ZIP code (One block of Broadway/Vermilyea/Dyckman/Academy falls within the Fort George 10040 code).
Notably, while Inwood is the northernmost neighborhood on the island of Manhattan, it is not the northernmost neighborhood of the entire borough of Manhattan. That distinction is held by Marble Hill, a Manhattan neighborhood situated directly to the north of the island of Manhattan on the North American mainland. It was isolated from the rest of Manhattan only in the 20th century when the route of the Harlem River was altered by the Harlem River Ship Canal.
Because of the hilly geography and the interruption of the street grid (Broadway is the only local street that continues into Inwood), the neighborhood can seem somewhat disconnected from the rest of Manhattan. It is also often mistaken by non-residents as a sub-section of the larger and better-known Washington Heights area to the south, or simply combined with it as "Washington Heights-Inwood".
Inwood's main local thoroughfare is Broadway, which is also designated US 9 at this point. Highway access to the area is via the Henry Hudson Parkway to the west, the Harlem River Drive/FDR Drive to the southeast and the Major Deegan Expressway over the Harlem River to the east. Inwood's main commercial shopping streets are Broadway, Dyckman Street and West 207th St.
Washington Heights & Inwood Online
Welcome to the WaHI Online Discussion Forums
« on: 05/24/03, 17:51
Welcome to the discussion forums. We hope that this will become a great place for residents of Washington Heights and Inwood to exchange all kinds of information and to help one another.
March 15, 2004
BoCoCa - Not a New Cocoa
 | 03/15/04 01
Re: janelle calling Washington Heights "NoMan" - Hee! Good call! I've already seen Washington Heights and Inwood get grouped together as something called WaHI, which I hope doesn't stick.
New York (NY) Times
Habitats/Upper Manhattan; Two Inwood Apartments, With Two Mindsets
By PENELOPE GREEN
Published: April 18, 2004
Riverside Drive ends in Inwood, Manhattan's northernmost neighborhood, just a half hour or so by the A train from Waverly Place (and gathered hilariously with its neighbor, Washington Heights, into a new acronym, WaHI; rhyme it with mahi-mahi).
New York (NY) Times
New Winds at an Island Outpost
By MANNY FERNANDEZ
Published: March 4, 2007
In a sense, the neighborhood is becoming two neighborhoods, even down to its name. Old-timers call it the Heights; newcomers, particularly those who log onto http://www.washington-heights.us, refer to Washington Heights and its northern neighbor Inwood as WaHI, in a kind of SoHo-speak.
New York City • Neighborhoods • (0) Comments • Tuesday, November 30, 2004 • Permalink