The Rio Grande River.
I guess it's the Pacific Ocean
Most of it is defined by the Rio Grande River (Rio Bravo del Norte, as it is known in Mexico).
The Mexican border is fenced up to 2000 miles long.
I guess it's the Pacific Ocean
Pretty much just Canada and Mexico.
The Qinling Mountains make up much of the eastern border of the Middle Kingdom. This natural barrier separates the central plains of China from the eastern coastal regions.
Rio Grande River
It is called US-Mexico border. If you mean the name of the river that defines much of that border, it is called the Rio Grande river (or Rio Bravo del Norte in Mexico).
The Great Plains from Minnesota to North Dakota makes up the majority of the United States' border with Canada. The rest of the border is made up mostly by the Great Lakes and the Rocky Mountain and Cascaded Mountain Ranges.
The Rio Grande river is a border along much of the USA and Mexico.
200 billion dollars