Both North Dakota and South Dakota share a border with Minnesota. South Dakota also shares an eastern border with Iowa.
The US state of Minnesota borders North Dakota and part of South Dakota on their eastern borders and the US state of Montana borders North Dakota and part of South Dakota on their western borders.
Montana borders North and South Dakota,
Montana borders North Dakota and South Dakota and also contains part of the Rocky Mountains.
There is no country which borders both North Dakota and South Dakota. North Dakota shares a border with Canada.
South Dakota
North Dakota borders South Dakota. North Carolina borders South Carolina.
Minnesota. Minnesota's western border is on the entire eastern border of North Dakota and on much of the eastern border of South Dakota until it reaches the latitude that separates Minnesota from Iowa.
The answer is South Dakota. Kentucky borders Tennessee to the north. South Dakota borders Nebraska to the north.
South Dakota borders Nebraska on the north.
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 US state of Montana has an eastern border with North Dakota and South Dakota.