The facts
Dokdo Island is a small volcanic island located next to Ulleungdo Island (87.4km away) on the far east of Korea. The island is mainly composed of two rock islands with small rock formations in the middle.
It's designated as Korea's official natural monument No. 336.
Collectively, both Ulleungdo Island and Dokdo once belonged to a country named Usanguk. According to geographical records, Usanguk became part of the Silla Kingdom (57B.C. ~ 935 A.D.) in June of the 13th year that King Jijeung ruled Silla. Isabu (a general and politician of Silla) gained significant strength during this period to overtake Usanguk.
You can visit the island by ship.