Busan, in the southeast of Seoul, with a distance of 450km, the second largest city of South Korea, logistics center in the Pacific Rim. A famous good deepwater port, leading the world in facility and transfer capacity at present. Located at 129°E and 35°N, bordering on Korea Strait (called Dahanhaixia, Korea Strait by South Korea) in the southeast, facing Tsushima Island of Japan; close to Nakdong River in the west. Mountains tower in northwest, islands barrier in the south, south portal of the peninsula.