Kansas and Oklahoma
California and Nevada
Oregon and Washington
Montana and Wyoming
Idaho and Montana
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.
Nebraska and South Dakota
New Mexico and Texas
Virginia and West Virginia
The border between Canada and The United States of America is one of the longest in the world. Until 9/11 it was the world's longest undefended border. ------------------------- Russia, Denmark, Norway, and the USA. We share a border with all of them.
No, Ontario has the longest border with Canada and the US.
The states in the region that share an international border are [insert specific states that share a border].