The source of the River Tweed is located in the Lowther Hills in Southern Scotland, near Tweedsmuir. It flows eastward and forms part of the border between Scotland and England before emptying into the North Sea at Berwick-upon-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 42nd parallel forms the southern boundary of Idaho. It marks the border between Idaho and Nevada as well as a portion of the border between Idaho and Oregon.
The Yalu River forms a natural border between China and North Korea. It serves as a strategic boundary line and plays a significant role in the relationship between the two countries.
The Cheviot Hills is a range of hills that forms part of the border between Scotland and England. The hills stretch for about 30 miles across the border region.
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 Connecticut River forms most of the border between Vermont and New Hampshire. It is the longest river in New England, flowing south from the Connecticut Lakes in New Hampshire to Long Island Sound in Connecticut.
The Limpopo forms that border between Zimbabwe and South Africa.
The source of the River Tweed is located in the Lowther Hills in Southern Scotland, near Tweedsmuir. It flows eastward and forms part of the border between Scotland and England before emptying into the North Sea at Berwick-upon-Tweed.
The Colorado River forms the border between Arizona and California
The Limpopo forms that border between Zimbabwe and South Africa.
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 Mekong River forms a border between Thailand and Laos.