Two rivers through which the International border runs are Rainy River and Pigeon River.
Two other rivers through which the International border runs are St Marys River and St Clair River.
Two more rivers through which the International border runs are Detroit River and Niagara River.
Lake Erie
There are two rivers that form part of the border between New York and Canada - the Niagara and the St Lawrence
The St. Lawrence River and the Columbia River border Canada and the United States.
Mexico and Canada.
Rio Grande and Nueces rivers.
The Saint Lawrence river on the US / Canadian border and the Rio Grande On the US / Mexico border.
Mexico and Canada
Canada and Mexico
Mexico/Canada
The two US National Parks that border with Canada are Glacier National Park and Waterton Lakes National Park.
Do you mean countries? If you do, the two countries that border the U.S. are Canada and Mexico.
Canada and Mexico