Port Hamilton (known as Geomun-o in Korean, Hangul: 거문도 [Komundo or Geomun-do], Hanja: 巨文島 or 巨門島) is a small group of islands in the Jeju Strait off the southern coast of the Korean Peninsula, located approximately at 34°1′35″N, 127°18′45″E. There are three principal islands, the two larger ones, Sodo to the west (Seo-do, 서도, 西島) and Sunhodo to the east (Dong-do, 동도, 東島) forming a harbor with the smaller island in the center. On this central island, Observatory Island (or Go-do, 고도, 古島), there was a British naval base from 1885 to 1887.