The tweed
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 Danube
the yalu river
The Mekong River
The Rio Grande, Spanish for grand river, forms the southern border of the United States, but it only forms the border between Texas and Mexico. New Mexico is not bordered by the Rio Grande, for example, but rather the Rio Grande runs through New Mexico.The only river that partially forms the southern border of the U.S. is the Rio Grande on the Texas/Mexico border.The rest of America's souther border with Mexico is a land border in souther New Mexico, Arizona, & Colorado.
England is a country that forms part of Great Britain. Great Britain also consists of Wales and Scotland, with which England has borders. Great Britain also includes Northern Ireland, which does not border England, Wales or Scotland, but which is accessible via air or sea.
Lake Champlain
The Limpopo forms that border between Zimbabwe and South Africa.
The Limpopo forms that border between Zimbabwe and South Africa.
The Colorado River forms the border between Arizona and California
The border between Mississippi on the west and Arkansas on the east is the Mississippi River. It also forms the border between Arkansas and Tennessee.
The Atlantic Ocean forms the eastern and southern border of New England.
the river that forms the border between India and Kentucky is the Mississippi River.
The Missouri River forms the border between Iowa and Nebraska.
The Colorado River forms the border between Arizona and California.The Colorado River.
The Mississippi River forms the border between Missouri and Illinois.
The Colorado River forms the border between Arizona and California.The Colorado River.