"Shinzo Togoku Yochi Shoran (Sinjeung Dungguk Yeoji Seungram (The Revised and Augmented Edition of the Survey of the Geography of Korea))"

*Uzan Island (Usando) and Utsuryo Island (Ulleungdo) are also called Buryo (Mureung) or Uryo (Uleung). These two islands are located in the ocean due east of the province. Three lofty peaks stand as if they would reach the sky, but the peak on the south side is not as high. When the weather and wind is good and the sky is clear, you can clearly see some trees around the top of the peaks and coastlines at the foot of them. If the wind is good, you will reach there within two days. It says that Usando and Ulleungdo were originally the same island, and its circumference is approximately 40km.