Some Sevit

Sebitseom, name stylized as Some Sevit and sometimes known as the Sebit islets , are artificial islands in the Han River in Seoul, South Korea. It is the world's first floating structure built on a buoy that can stay afloat on water. It was built at the suggestion of Kim Eun-sung in 2006. Seoul City made this island by Build-Transfer-Operate. It has 3 islands: Gavit, Chavit, and Solvit. Yevit is part of Sebitseom, but is not an island itself, but rather, it's an on-land multimedia art gallery complementing the three floating islands.

Source: Wikipedia