[2] There is another Biyangdo that is now connected to Udo which is also part of Jeju City.

[3] The island was once called Jukdo (죽도; 竹島; lit.

It has a 114 m (374 ft) tall peak called Biyangbong (비양봉).

[2] There is a record of a volcanic event on the island around 1002 CE, during the fifth year of Mokjong of Goryeo's reign.

For five days, lava flowed out of four holes on the mountain Seosan (서산; 瑞山) on the island.