atlantic
The Gulf of Mexico is Mexico's major body of water on its south eastern border.
Atlantic Ocean
The Atlantic Ocean forms most of the eastern border of these regions.
The Atlantic Ocean made the eastern border of the colonies in North America.
Azerbaijan is not a body of water. It's a country on the border of the Caspian Sea. Azerbaijan is in Europe and Aisa.
Please rephrase - the question is unclear.
The East China Sea likely served as the body of water forming the eastern border of the Chinese Zhou territory in ancient times.
The Black sea and the Aegean sea
The Atlantic Ocean borders the U.S. east coast.
The bodies of water that border the US on the east and west are the Atlantic Ocean (east) and the Pacific Ocean (west).
The eastern part of the Roman empire bordered the Pontus Euxinus, or as we call it, the Black Sea.
Guyana, French Guiana, and Brazil share borders with Suriname. Guyana is on the western border. Brazil is on the southern border. French Guiana is on the eastern border. The Atlantic Ocean is on the northern border.