Situated in the northeastern US, New Jersey is the smallest of the Middle Atlantic states and ranks 46th among the 50 states.
The total area of New Jersey is 7,787 sq mi (20,168 sq km), of which 7,468 sq mi (19,342 sq km) constitute land and 319 sq mi (826 sq km) are inland water. New Jersey extends 166 mi (267 km) N-S; the extreme width E-W is 57 mi (92 km).
New Jersey is bordered on the N and NE by New York State (with the boundary formed partly by the Hudson River, New York Bay, and Arthur Kill, and passing through Raritan Bay); on the E by the Atlantic Ocean; on the S and SW by Delaware (with the line passing through Delaware Bay); and on the W by Pennsylvania (separated by the Delaware River). Numerous barrier islands lie off the Atlantic coast.
New Jersey's total boundary length is 480 mi (773 km), including a general coastline of 130 mi (209 km); the tidal shoreline is 1,792 mi (2,884 km). The state's geographic center is in Mercer County, near Trenton.