Asia
Antarctica.
The shortest distance between the Canadian border and the Mexican border is 2,253.37 miles. This is equivalent to 3,626.45 kilometers.
Rhode Island, since it is the smallest state, would take the shortest distance from border to border (at complete opposite ends).
There are 16 countries that touch the border of China. Hong Kong has the shortest border touching China with the length of 30 km.
Africa has the longest land border of any continent. It is surrounded by the Atlantic Ocean to the west, the Indian Ocean to the southeast, and the Mediterranean Sea to the north.
Asia
Luxembourg
Depends on what continent you live on. You need to name the continent.
The shortest distance from border to border is 340 miles.
The shortest driving distance from border to border is 654 miles.
Europe and Africa border Asia.