The Hudson River and the Atlantic Ocean.
The Atlantic Ocean forms the eastern and southern border of New England.
The Connecticut River forms the eastern border of Vermont. The river is 410 miles long and is the longest river in New England.
New Jerseys state bird is the Eastern Goldfinch. ----
New Brunswick, Canada is east of Maine, USA.
While no river forms the eastern border of NY, the Hudson River is within 20 miles or so of the border.
The Delaware River forms Pennsylvania's eastern border. Across the river are New Jersey and New York
Arizona's eastern border is shared with the state of New Mexico.
It is about 70 miles from the eastern to western border of New Jersey.
Philadelphia is right on the New Jersey border. The Delaware River forms the eastern perimeter of Philadelphia and New Jersey is right across the river. So technically less than a mile.
The bodies of water that border the US on the east and west are the Atlantic Ocean (east) and the Pacific Ocean (west).
New York is bordered by Connecticut, Massachusetts, and Vermont to the east. It also has an eastern border with the Atlantic Ocean.
Thirteen counties in New Jersey border the eastern side of the state.