U.S. Customs and Border Protection Monitors Canadian-American Border By Land, Air And River Patrols

BUFFALO, NY - JUNE 03: A U.S. Border Patrol agent looks over Lake Erie near the U.S.-Canada border on June 3, 2013 in Buffalo, New York. U.S. Customs and Border Protection, which includes the Border Patrol, monitors the 5,525 mile long border, including Alaska, forming the longest international border between two countries in the world. (Photo by John Moore/Getty Images)