The Ohio River forms Ohio's southern boundary. It serves as a natural border between Ohio and West Virginia, as well as Kentucky. This river is a significant waterway in the United States, flowing westward before joining the Mississippi River.
The Atlantic Ocean forms the eastern boundary of the Southeast, while the Gulf of Mexico forms the southern boundary.
The Mediterranean Sea is the body of water that forms the southern boundary of Europe. If a person crosses the Mediterranean Sea to the south they will reach the continent of Africa.
Mediterranean Sea
antic
black sea
The Atlantic Ocean forms the state's eastern boundary.
The Rio Grande
The Atlantic Ocean.
The Yellow Sea formed the eastern boundary of Shang territory, while the Yangtze River marked the southern boundary.
Niger River
Gulf of Guinea
The Red River (of the North) forms North Dakota's eastern boundary with Minnesota.