The two countries that share the longest international border are Canada and the United States. This border stretches for approximately 8,891 kilometers (5,525 miles), making it the longest international boundary in the world. The border is characterized by diverse landscapes, including forests, mountains, and lakes. It is also marked by numerous points of entry and an extensive agreement on trade and immigration, reflecting the strong economic ties between the two nations. The Canada-United States border serves as a significant historical and modern connection, influencing both countries' cultures and economies.