A Japanese scholar of practical science, Hayashi Shihei, published "Map of Three Adjoining Countries" (三國接壤地圖) in his work "Sangoku Tsūran Zusetsu" in 1785, which showed each country in distinct colours; Joseon (old name of Korea) in yellow, Japan in green. In the map, Ulleungdo and an island to its northeast were marked "As Korean territories (朝鮮ノ持ニ)". The name of the larger island was given as "竹嶋", the current name of Ulleungdo then in Japan. According to Korean scholars, the islands to the northeast of Ulleungdo represent the Liancourt Rocks, and thus proves Liancourt belonged to Korea at the time. According to Japanese scholars, neither of these conclusions are necessary or even probable, as the Liancourt Rocks are located southeast of Ulleungdo.
