It is Turkmenistan and Azerbaijan that border the northern part of Iran.
The Caspian sea forms Azerbaijan's eastern border.
The River Arax forms most of the border between the part of Azerbaijan which is independent (Republic of Azerbaijan) and the part which is part of Iran.
The body of water that forms part of the border of Georgia is the black sea.
The body of water that forms part of the border of Georgia is the black sea.
Kentucky forms most of the northern border of Tennessee.
The Himalayan Mountains are what form India's northern Border.
Illinois is closer to the Ohio River than Georgia. The Ohio River forms the northern border of Kentucky, which is adjacent to Illinois. In contrast, Georgia is located much further south and does not border the Ohio River at all.
Azerbaijan is not a body of water. It's a country on the border of the Caspian Sea. Azerbaijan is in Europe and Aisa.
Rio Grande forms the Southern border of the United states.
savannah
The Chattahoochee River forms Georgias's southwestern border.