Ulleng-do (Ullengdo Island) which is situated at the eastern
extremity of South Korea belongs to Ulleng-gun, Gyeongsangbuk-do
of the administrative district. The direct distance
from east to west, and from south to north is 10 km and 9.5
km respectively, total extent is 73.5 km2
, and it is a volcanic
island created by large-sized volcanic activity in the
continental shelf of the East Coast from the Miocene epoch
to the Pleistocene epoch. Dokdo belongs to Dokdo-ri,
Ulleung-eup, Ulleung-gun, Gyeongsangbuk-do, total extent
is 187.544 m2
, and it is divided into Seo-do and Dong-do
(Ulleung-gun Journal, 2007). It was designated as a natural
monument no. 336 ‘Dokdo Natural Reserve’ in 1999, and it
has a great academic value as it has not been influenced by
human’s activities and maintains natural biota.
As for the comprehensive research report on Ulleung-do
and Dokdo, ‘Comprehensive academic report on Ulleungdo
and Dokdo’ implemented by the Korean Association for
Conservation of Nature in 1981 reported the biota of land
and marine life in Ulleung-do and Dokdo (Korean Association
for Conservation of Nature, 1981). Marine biota in
Ulleung-do and Dokdo is different from that in the East
Coast on the same latitude, and it is reported that the biota is
rather similar to that in the South Coast such as Jeju Island
due to the influence of warm current (Ministry of Maritime