Montana
In the west, the state of Montana has the longest linear border with Canada. In the east, the state of Michigan has the longest border, including the Great Lakes.
The western states in the 48 contiguous states that have the longest border with Canada are Washington and Montana. Washington shares a border with British Columbia, while Montana shares a border with Alberta, Saskatchewan, and British Columbia.
Montana
montana, 48 degrees
No, Ontario has the longest border with Canada and the US.
At 8891 km, the border between Canada and the USA is the longest between any two countries, but a major section of that border (with Alaska) is not contiguous with the rest. The longest contiguous section of border between two countries in the world is between Russia and Kazakhstan, at 6846 km.
canada
The US-Canada border is the longest border in the world. It stretches for 8,891 km.
Canada.
Mauritania, has the longest border with Mali located in Western Africa.
The countries with the longest land border are Canada and the United States. They share a border that is approximately 8,891 kilometers (5,525 miles) long.