West End Avenue is a north-south thoroughfare on the West Side of the borough

Borough (New York City)

New York City, one of the largest cities in the world, is composed of five boroughs. Each borough now has the same boundaries as the county it is in. County governments were dissolved when the city consolidated in 1898, along with all city, town, and village governments within each county...

 of Manhattan

Manhattan

Manhattan is the oldest and the most densely populated of the five boroughs of New York City. Located primarily on the island of Manhattan at the mouth of the Hudson River, the boundaries of the borough are identical to those of New York County, an original county of the state of New York...

 in New York City

New York City

New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...

, not far from the Hudson River

Hudson River

The Hudson is a river that flows from north to south through eastern New York. The highest official source is at Lake Tear of the Clouds, on the slopes of Mount Marcy in the Adirondack Mountains. The river itself officially begins in Henderson Lake in Newcomb, New York...

.

West End Avenue originates at West 59th Street

59th Street (Manhattan)

59th Street in the New York City borough of Manhattan runs east-west, from York Avenue to the West Side Highway, with a discontinuity between Ninth Avenue/Columbus Avenue and Eighth Avenue/Central Park West for the Time Warner Center. Although it is bi-directional for most of its length, the...

; the continuation of the street below 59th Street is called Eleventh Avenue

Eleventh Avenue (Manhattan)

Eleventh Avenue is a north-south thoroughfare on the far West Side of the borough of Manhattan in New York City, not far from the Hudson River. It carries downtown traffic only, south of West 44th Street, and two-way traffic north of it....

. It runs from 59th Street to its termination where it merges with Broadway

Broadway (New York City)

Broadway is a prominent avenue in New York City, United States, which runs through the full length of the borough of Manhattan and continues northward through the Bronx borough before terminating in Westchester County, New York. It is the oldest north–south main thoroughfare in the city, dating to...

 at 107th Street, at Straus Park

Straus Park

Straus Park is a small landscaped park in Morningside Heights, Manhattan, at the intersection of Broadway, West End Avenue, and 106th Street....

. Traffic is two way for most of its length.
By the 1880s, the Upper West Side

Upper West Side

The Upper West Side is a neighborhood in the borough of Manhattan, New York City, that lies between Central Park and the Hudson River and between West 59th Street and West 125th Street...

 was fairly sparsely populated, and was called the "West End" because of its separation from the core of the city.