black sea
black sea
The Gulf of Mexico.
Prior to the Louisiana Purchase in 1803, the western border of the US was mostly the Mississippi River.
A natural boundary that is not a body of water could be formed by physical features such as mountains, deserts, or forests. These features act as barriers and define the limits of a region or country.
Washington DC the Potomac river. Washington state the Pacific Ocean.
Thermocline.
East in Mississippi River and West in Rocky Mountains
Shoreline
Shoreline
Mediterranean Sea
"shore"
eastern is the Mississippi river and the west is the rocky mountains