The North Bronx is the northern section of the Bronx, one of the five boroughs of New York City. It is bordered by Westchester County to the north, the South Bronx to the south, the Hudson River to the west and the Long Island Sound to the east. The western part is more urbanized and hilly than its eastern counterpart, just like the rest of the borough. Despite being recognized as different from the South Bronx, the actual borders of the North Bronx is undefined. One commonly set border is Fordham Road/Pelham Parkway, the upper limit for widespread poverty and arson during the 1970s and 1980s.