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North America and South America share a land border with the United States.
Asia
The longest land border between any two continents is between Asia and Africa, specifically at the border shared by Egypt and Israel. This border separates the African continent from the Asian continent at the Sinai Peninsula region.
The shortest land border between continents is the border between Africa and Asia, which is mainly marked by the Suez Canal in Egypt, with a length of around 120 meters (394 feet). Another short land border between continents is the border between Europe and Asia, which is defined by the Ural River and the Ural Mountains in Russia, with a length of about 300 kilometers (186 miles).
When countries share a border, it is called a "land border" or a "physical border".