"Located in eastern Asia on the southern half of the Korean Peninsula bordering the Sea of Japan and the Yellow Sea, Busan, also known as Pusan, is the largest port city in the Republic of Korea. With a population of about 3.65 million, Busan is also South Korea's second largest metropolis, after Seoul. The Gamman terminal in the port of Busan, Korea was designated a Secure Freight Initiative (SFI) Phase 1 port in December 2006, after becoming a Container Security Initiative (CSI) port in January 2003. Phase 1 launches the Secure Freight Initiative International Container Security project evaluating radiation scanning at foreign ports. Operational testing is scheduled to begin as early as October 2007. Among worldwide seaports that export containers with goods destined for the United States, Busan is sixth in terms of the volume of shipments and containers imported into the United States. In fiscal year 2006, Busan processed 610,061 shipments bound for the United States, constituting 5.25 percent of all shipments to the United States, involving 683,363 containers representing 6.68 percent of shipping containers arriving in the United States. Key exports to the United States include semi-conductors, wireless telecommunications equipment, motor vehicles, computers, and steel. The Gamman terminal in the port of Busan is one of four Secure Freight Initiative port operations scanning cargo bound for the United States on a limited basis."
U.S. Customs and Border Protection: http://www.cbp.gov/