the bronx (bronx county) is new york city's northernmost borough. it is the only new york city borough with most of the land being on the mainland united states. the yankee stadium, the baseball park of the new york yankees, and the biggest cooperatively owned housing complex in the united states, co-op city, are in the bronx. the bronx zoo, the world's largest metropolitan zoo, is also in the bronx. it is big and has more than 6,000 animals. rap and hip hop culture were created in the bronx. pelham bay park is the biggest park in new york city, at .