Here's the short answer: not very!
The fourth smallest State in the country, New Jersey is only larger than Connecticut, Delaware, and Rhode Island.
The land area is 7,417.34 sq. mi. The inland water is an additional 371 sq. mi. and the coastal water adds another 425 sq. mi.
The maximum length north and south of New Jersey is166 miles; the maximum width east and west is 57 miles.
The coastline is 130 miles long.