THE Bronx, geographically an unbroken extension of Westchester County (of which it was once a political division), is the only New York borough on the mainland. It occupies an area of 42 square miles (with so miles of water front), and lies at the northern extremity of the city -- in the upper portion of a "Y" formed by the East and Harlem rivers. The Hudson flows past the upper western flank of the borough, and Long Island Sound ends among the islands off the eastern shore. Across the narrow, high-banked Harlem is Manhattan, its long northern extremity snuggling against the Bronx and joined to it by fourteen bridges and three subway tunnels; beyond the flat, irregular shores of the East River is Long Island, linked to the Bronx by the Triborough, New York Connecting Railroad, and Bronx-Whitestone bridges.
Hunt's Point, Clason's Point, Screvin's Neck, and Throg's Neck are large peninsulas of low, salt meadowland jutting into the East River and separated by small bays and streams like Pugsley's Creek, Westchester Creek, and the shallow Bronx River. The last-named descends from the Westchester hills through the middle of the Bronx, while in the northeast the even smaller Hutchinson River empties into Eastchester Bay, which splits Pelham Bay Park. From the northern section of the park extends the Rodman's Neck-Orchard Beach-Hunter's Island peninsula; near by, in the waters of the Sound, are City Island, Hart's Island (site of Potter's Field), and several rocky islets.