Geographical map of Ulleungdo and Dokdo islands with insets showing collection sites. Insets provide a detailed view of Ulleungdo with Seonginbong, Taeharyeong and Nari Basin, as well as the two main islands (Dongdo and Seodo) of Dokdo. Yellow points are the collection sites established at Ulleungdo and red points are those established at Dokdo.