We have three, pick any two, Arctic, Pacific and Atlantic.
Do you mean countries? If you do, the two countries that border the U.S. are Canada and Mexico.
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.
Mexico and Canada.
Canada and Mexico are the two countries that border the United States.
Canada in the north, and Mexico in the south.
The USA and Canada border Lake Superior.
Canada and Mexico
canada
Canada and Russia
Mexico/Canada
The two US National Parks that border with Canada are Glacier National Park and Waterton Lakes National Park.
Canada, Mexico