Historical journal resources like Namsaillok that provides information on time and space. Based on useful information in the historical resoarces, like the exact location of the eighty Jeju ports or the places said to be related to Jeju horses, it was possible to mark the locations of the eastern and western Aimaq. Tamla ranch was one of the 14 national-run ranches in the Yuan Dynasty. The Yuan government sent an administrator to manage the ranch and there was no significant difference in operation when compared with ranches in the Yuan Dynasty. The Hachi, who came to Tamla to raise horses during the Yuan Dynasty, entered the family register of Jeju when the Ming Dynasty was involved in the horse administration, and it is guessed that they were classified as a surname of the Yuan dynasty. The locations of ports and horses transportation were very closely related. For example, the locations for breeding Jeju horses in the Western Aimaq areas, Chagwijin could have been at Seorimpo or nearby ports. Since the ranges for breeding Jeju horses were extended, Susan field, where the Eastern Aimaq areas were located, is related to the port of Seogwipo. Myeongwolpo, which was located near the 6th place for breeding horses in the Choseon Dynasty, was an important port for transporting horses and was also related to the distribution of the Hachi. It is not quite sure that horses departing from Myeongwolpo were transported to Zhejiang Dinghai by way of Mokpo, but this route was important as a way of transporting horses. There are two routes between Sourth Jeolla Province and Jeju: one route is leaving Naju for Haenam port using water channels by way of Muan and departing from Haenam port to Jeju; the other one departing from Kangjin, Hanam, or Youngam, which are located on the coast. Ships were sailed by using a north(or northwest) wind for trips from Jeollanam to Jeju and by using a east wind(or southeast) for reversed trips. It is thought that the route between Jeju Myeongwolpo and Dinghai in the southeast of China existed based on the information of the drifters who had left Jeju and had drifted near Choojado, and the return of the Jeju-born who had drifted in China. This southern sea route is a short distance. In the case of the port to the west of Jeju, especially Myeongwolpo was recorded as an common landing site for drifters during the Song Dynasty and the Ming and Qing period after the Yuan Dynasty. However, what was recorded as a port of China in the sources of the Yuan Dynasty is related to raising horses in Tamla, transporting horses to China, and traveling between Tamla and China. Although Jeju sometimes belonged to the Yuan Dynasty and sometimes was directly ruled by the Koryeo, we saw earlier that most of the authority over Tamla horses belonged to China. Jeju’s Sulryeok Routes started at the east gate of Jeju Fortress and returned to the west gate after making a complete trip around Jeju along the coast, when Lizheng traveled by this route, the reason to emphasize solidarity at the national level and to protect Jeju from Wokou. The ports with military forts were not concentrated in the east of Jeju, which is close to Japan, but were distributed throughout Jeju except for the northern section area. There were many military ports in the west close to the route between China and Japan. It is true that Jeju Island is on the southern border of the Korean Peninsula, but the reason that Jeju was able to go beyond the border was because there was a ranch to raise horses in Tamla managed by the Yuan Dynasty, and external ports in the late Yuan and the early Ming Dynasty were frequently used.
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