Question: The Riegelmann Boardwalk is in what southwestern borough in New York City? 

Context paragraphs:
Brooklyn Cyclones: The Brooklyn Cyclones are a minor league baseball team based in Brooklyn, New York that plays in the Short-Season A classification New York–Penn League, affiliated with the New York Mets.  The Cyclones play at MCU Park just off the Coney Island boardwalk in the New York City borough of Brooklyn.

Islanders–Rangers rivalry: The Islanders–Rangers rivalry, also unofficially known as the "Battle of New York", is a rivalry between the New York Islanders and New York Rangers of the National Hockey League.  Both teams play in New York City, with the Rangers in the borough of Manhattan, and the Islanders in the borough of Brooklyn.  They are two of the three teams that play in the New York metropolitan area, the other being the New Jersey Devils who play in Newark, New Jersey.  The rivalry is an intra-city rivalry similar to the Mets–Yankees rivalry in Major League Baseball and join the recent Knicks–Nets rivalry and yesteryear's Dodgers–Giants rivalry as professional sports rivalries between teams based in New York City's most populous borough, Brooklyn, and the location of most of New York's corporate headquarters and shopping districts, Manhattan.

Disco Freddy: Disco Freddy, also called Larry the Unbelievable at the beginning of his public career, was one of the notable characters during the late 1970s and early 1980s on the Riegelmann Boardwalk, which extends from Coney Island to Brighton Beach, in Brooklyn, N.Y. During his performing heyday, he was about 60 years old.

Edward J. Riegelmann: Edward J. Riegelmann (September 5, 1869 – January 15, 1941) was an American Democratic politician from Brooklyn, Kings County, New York, best remembered for the Riegelmann Boardwalk.

Queens: Queens is the easternmost and largest in area of the five boroughs of New York City.  It is geographically adjacent to the borough of Brooklyn at the southwestern end of Long Island, and to Nassau County farther east on Long Island; in addition, Queens shares water borders with the boroughs of Manhattan and the Bronx.  Coterminous with Queens County since 1899, the borough of Queens is the second-largest in population (after Brooklyn), with a census-estimated 2,333,054 residents in 2016, approximately 48% of them foreign-born.  Queens County also is the second-most populous county in the U.S. state of New York, behind the neighboring borough of Brooklyn, which is coterminous with Kings County.  Queens is the fourth-most densely populated county among New York City's boroughs, as well as in the United States.  If each of New York City's boroughs were an independent city, Queens also would be the nation's fourth most populous, after Los Angeles, Chicago, and Brooklyn.  Queens is the most ethnically diverse urban area in the world.

Riegelmann Boardwalk: The Riegelmann Boardwalk, named for Edward J. Riegelmann but known by many as the Coney Island Boardwalk, is located along the southern shore of the Coney Island peninsula in Brooklyn, New York City, adjacent to the Atlantic Ocean.

Boardwalk Empire (episode): "Boardwalk Empire" is the pilot episode of the HBO crime drama "Boardwalk Empire".  Written by series creator Terence Winter and directed by Martin Scorsese with a budget of $18 million, the episode introduces the character of Nucky Thompson, played by Steve Buscemi, as the corrupt treasurer of Atlantic City who is involved in gambling and bootlegging in 1920.  The show used a large ensemble cast and a specially constructed boardwalk set to re-create the Prohibition and Jazz Era, and was based on "Boardwalk Empire: The Birth, High Times and Corruption of Atlantic City" by Nelson Johnson.  Filming for the pilot took place at various locations in and around New York City in June 2009.  The episode first aired in the United States on September 19, 2010.

Coney Island: Coney Island is a peninsular residential neighborhood, beach, and leisure/entertainment destination on the Coney Island Channel, which is part of the Lower Bay in the southwestern part of the borough of Brooklyn in New York City.  The site was formerly an outer barrier island but became partially connected to the rest of Long Island by land fill.  The residential portion of the peninsula is a community of 60,000 people in its western part, with Sea Gate to its west, Brighton Beach and Manhattan Beach to its east, the Lower Bay to the south, and Gravesend to the north.

South Beach-Franklin Delano Roosevelt Boardwalk: The South Beach-Franklin Delano Roosevelt Boardwalk, alternately referred to as the F.D.R. Boardwalk or the South Beach Boardwalk is a boardwalk on the East Shore of Staten Island, one of the five boroughs of New York City.

Brooklyn: Brooklyn ( ) is the most populous borough of New York City, with a Census-estimated 2,629,150 residents in 2016.  It borders the borough of Queens at the southwestern end of Long Island, and has several bridge connections to the nearby boroughs of Staten Island and Manhattan.  Since 1896, Brooklyn has had the same boundaries as Kings County, the most populous county in the U.S. state of New York and the second-most densely populated county in the United States, after the county of New York (which is coextensive with the borough of Manhattan).

Supporting paragraphs: Disco Freddy Coney Island
Answer: Brooklyn