The longest shared border in the world can be found between which two nations?

The answer is Canada and the United States. These two nations share the longest international border in the world, stretching over 8,891 kilometers (5,525 miles). The border is formed by the landmasses and water bodies that separate North America, including the Great Lakes, the St. Lawrence River, and various other rivers, lakes, and forests. The border has been highly regulated and fortified, but it maintains a friendly and peaceful relationship, allowing for economic and cultural exchange between the neighboring countries.