 This document from An's second trip relays An's words that Ulleungdo, geographically subordinate to Gangwon province, was administered by Dongnae-bu.The document records the distance between Takeshima (Ulleungdo) and Matsushima (Liancourt Rocks) as 50 ri, and also states, in a rough copy of An's map of Korea, that the two islets belonged to Korea's Gangwon province.In the "Annals of King Sukjong", the official governmental chronicle, An is reported to have stated that Jasan-do 子山島(sic) was what the Japanese called Matsu-shima 松島 at that time.