Disputes - international:
Military Demarcation Line within the 4-km wide Demilitarized Zone has separated North from South Korea since 1953; periodic incidents with North Korea in the Yellow Sea over the Northern Limiting Line, which South Korea claims as a maritime boundary; South Korea and Japan claim Liancourt Rocks (Tok-do/Take-shima), occupied by South Korea since 1954
note: the two rocky islets of Tok-do have become a South Korean tourist destination - over 132,000 people visited them in 2009, most by ship but also a substantial number by helicopter