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Spain forms the eastern boundary of Portugal.
The country is Eritrea, and it's eastern boundary is formed by the Red Sea.
Spain is the only country to border Portugal to the east.
The Indian Ocean forms the eastern boundary of Africa.
The southern half of the eastern boundary of Alabama is the Chattahoochee River.
Canada forms the northern boundary of the United States.
The Atlanic Ocean
Minnesota.
The Connecticut River
Mississippi
Mississippi
The Mississippi River is the East boundary for Arkansas.