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The Yalu River was important during the Korean War because it was the border for the Chinese mainland.
The Sahara Desert was the southern border of the roman empire
Mississippi River
At the beginning of the US Civil War, the "southern" border States were Kentucky and Missouri. In this answer, Maryland is excluded in that although it was a pro=southern slave State, it cannot be considered a border State.
Texas and Arkansas each border Louisiana. All three can be described as as "southern States".
The Ural Mountains
There is no geographical feature that forms the border between Portugal and Spain. The Strait of Gibraltar and Mediterranean Sea separates Iberian Spain and Morocco. The Pyrenees Mountains forms the border between Spain and France and Spain and Andorra.
The most notable is the Himalayan mountain range.
The Yalu River was important during the Korean War because it was the border for the Chinese mainland.
A river, mountain, canyon, ocean, or any other geographical feature that separates two regions. This can also be man-made buildings and structures, but discludes any political borders such as state's border or a coutry's border.
In geographical terms, this would be whether Nevada is south of Idaho. Yes, the state of Nevada forms part of the southern border of Idaho.
One primary geographical similarity between Paraguay and Zambia is that both are landlocked countries meaning the two nations are not surrounded by any body of water.Paraguay and Zambia also lie in the southern Hemisphere.
Border? It is on the southern US border.
there is no geographical border between Pakistan and Japan
The Republic of Texas extended up into the current state of Wyoming. The Red River and the Arkansas Rivers marked some of the boundaries.
The Sahara Desert was the southern border of the roman empire
The Black Sea, Sea of Marmara, the Meditterrean Sea and various other seas and straits.