The Red River (of the North) forms North Dakota's eastern boundary with Minnesota.
The Missouri flows through western and central North Dakota. The Red River of the North forms the eastern border of North Dakota.
The country is Eritrea, and it's eastern boundary is formed by the Red Sea.
Spain forms the eastern boundary of Portugal.
Montana borders North Dakota and South Dakota to the east.
There is no lake which borders North Dakota. The Red River of the North forms the eastern border of North Dakota. Lake Oahe crosses the border between North Dakota and South Dakota.
The Indian Ocean forms the eastern boundary of Africa.
The southern half of the eastern boundary of Alabama is the Chattahoochee River.
Spain is the only country to border Portugal to the east.
The Ural Mountains form the eastern boundary of Europe. These mountains separate Europe from Asia and stretch approximately 1,550 miles from north to south.
The Atlanic Ocean
The U.S. state that borders Minnesota to the west is North Dakota. The border between Minnesota and North Dakota runs along the Red River, which forms a natural boundary between the two states.