1 天前 · South Korea has two volcanic islands—Jeju, off the peninsula’s southern tip, and Ulleung, about 85 miles (140 km) east of the mainland in the East Sea—and a small-scale lava plateau in Gangwon province. In addition, South Korea claims and occupies a group of rocky islets—known variously as Liancourt Rocks, Dok Islands (Korean), and Take Islands (Japanese)—some 55 …