The atlantic ocean
The Atlantic Ocean
the northeast border of Texas is the red river
Iran forms the northeast border of Persian Gulf
The Hudson River and the Atlantic Ocean.
The Snake River forms part of Oregon's eastern border
The Mississippi River forms most of Arkansas's eastern border.
The river Rhine forms the eastern border of the French region of Alsace. It does not border the region of Lorraine. Note: Alsace and Lorraine are two separate French Regions, not one region.
The Black Sea forms a small portion of the Eastern border of Europe. The Mediterranean is also part of the Southeastern border.
Canada
Eastern Border
Georgia's eastern border is the Atlantic Ocean
The Caspian sea forms Azerbaijan's eastern border.