The old territory of the literature ---'Goguryo, Buyeo, and Korea are the successors of Gojoseon'.

The late Joseon Dynasty (Dangun Joseon) was the first country in our history and had the largest territory as a single country. The west was the Nanha near the current Beijing, the north was the border between China and Mongolia, the Heukryonggang River, the border between China and Russia, and the south was the entire Korean Peninsula and Manchuria. In the "Samguk Yusa" Gojoseon, it is recorded that Gojoseon moved the capital from Asadal to Asadal four times through Pyongyang-Baekaksan Asadal-Jangdanggyeong. It makes it possible to assume that if Gojoseon had moved the capital four times, the territory would have been quite large. The map of the Sipgu Saryak Tongo drawn by Chinese historian Jeung Seon-ji in the 13th century shows that the territory of Gojoseon encompasses Manchuria, and the Great Wall, the border between Gojoseon and China, ended in the northwest of Balhae. In the History of Sagi Qin Shi Huangbongi, the territory of the Qin Empire, which unified China, reached the sea and Joseon in the east, and the border with Joseon was called Yodong. This refers to the situation in 221 (the 26th year of Qin Shi Huang) before AD, and it shows that the western border of Gojoseon was in Liaodong. This period was before the founding of Wimanjoseon, and it was during the Gojoseon (Dangunjoseon) period. What is important here is the location of fluctuations at the time, and the location of fluctuations in ancient times and fluctuations in present times are different. It is recorded that Goguryeo was 1,000 ri east of Yodong in the "Huhanseo" Dongiyeoljeon Hall and "Three Kingdoms" Ohhwanseon Bidongjeon Hall of Goguryeo was located 1,000 ri east of Yodong. Since Goguryeo was located in the current Liaodong, it can be seen that the ancient Liaodong was 1,000 miles west of the current Liaodong. That was the border between Gojoseon and Jin. Then, where is the fluctuation of ancient times? According to the records of "Sagi" Jinshi Hwang Bon-ki, the ancient Liao-dong was the Galseoksan Mountain area. The location of Galseoksan Mountain, which appears in "Sagi"'s Jinshi Hwangbongi and Hyomubongi, coincides with the current Galseoksan Mountain in the eastern basin of Nanha. It makes us know that the downstream basin of the orchid was an ancient fluctuation. There are several records supporting the fact that ancient fluctuations were ancient fluctuations along the Gojoseon Line in the west of 1,000 ri from now on. In the Mongnyeomyeoljeon Hall of Sagi, the Great Wall of China built on the border began at Imjo and reached a fluctuation, and in the Dangbinjeon Hall of Jinseo, it was said that "the Great Wall was restored, but it reached Galseoksan Mountain. These records show that the end of the Great Wall of China was the Galseoksan Mountain area in Liaodong. On the map of "Sipgusagaktongo", Yosu is drawn in the northwest of Balhae, and the Great Wall of China penetrated it from the west to reach the fluctuation. Hoenam Choo Hyung-hoon explained that Yosu leaves Galseoksan Mountain and enters the sea from the southwest of Liaodong. The only big river flowing along Galseoksan Mountain is orchids. Therefore, it can be seen that the ancient Yosu was difficult today. According to Sagisaekaegi, Galseoksan Mountain was located in Suseonghyeon, Nakrang-gun, and Tongjeon recorded that Galseoksan Mountain was located in Noryonghyeon, where the Great Wall began to speak to Taegangjiji. During the Tang Dynasty, when Tongjeon was compiled, Noryonghyeon was the downstream basin of the current Nanha. Therefore, it can be seen that Galseoksan Mountain, where the Great Wall of China began, is now Galseoksan Mountain in the downstream basin of the orchid. One question arises here. It is said in the literature introduced earlier that the Great Wall of China started (or ended) at Galseoksan Mountain, and the area was fluctuating, but the Great Wall of China started at Suseonghyeon, Nakrang-gun in "Taegangjiri." Suseong-hyeon was one of the 25 prefectures that belonged to Nakrang-gun. Nakrang-gun was formerly a territory of Wimanjoseon, and before that, it was a territory of Gojoseon. Therefore, the above record is to say that Galseoksan Mountain, where the Great Wall of China began, was originally in Gojoseon territory. This means that Galseoksan Mountain was on the border. Suseong-hyeon, Nakrang-gun, was originally located in the westernmost border of Gojoseon, and it can be seen that it was located in the east with Galseoksan Mountain, which is currently located in the downstream basin of the orchid, as the western boundary. Galseoksan Mountain is located on the border between Gojoseon and China, and the east was Gojoseon and the west was China. Galseoksan Mountain in the orchid basin needs to organize the concept of fluctuation here on the western border. Yodong originally meant a distant place in the east, and it was a word that Chinese people refer to the easternmost border area. Therefore, when China's eastern border moved, the location of fluctuations also moved. The reason why today's fluctuations are more east of ancient fluctuations is because Hansa-gun was established in the current Yoseo area and China's territory was expanded to the present Yoha. Due to the above historical evidence, it can be seen that the boundary between Gojoseon and China was the current Nanha and Galseoksan Mountain. This is the situation of the Qin Dynasty in the 3rd century before the AD. However, even at a time ahead of the Qin Dynasty, records show that the border between Gojoseon and China was not east of this, but rather west. There is a record in Yeomcheolon that the Yeon Dynasty was cut off by Sagok and surrounded by Yosu with Galseoksan Mountain as a fortress. This refers to the situation of the national era, and at that time, Yeonnara borders Gojoseon. Therefore, even in the Warring States period ahead of the Qin Empire, it can be seen that the border between Gojoseon and China consisted of Galseoksan Mountain and the current orchid. The Eunjeon Hall of "Sangseo Daejeon" and Songmijasega of "Sagi" record that a reporter fled to Joseon in 1100 AD. This shows that Gojoseon existed before 1100 AD, and the geography of "Hanseo" and "Jinseo" records that the later Joseon-hyeon, Nakrang-gun, was the place where a reporter lived in exile in the past. Since Joseon-hyeon belonged to Nakrang-gun with Suseong-hyeon, it can be seen that the place where the reporter fled was not far from Galseoksan Mountain. Until 1100 AD, the border between Gojoseon and China was in the Nanha and Galseoksan regions, and the place where the reporter fled was in the western part of Gojoseon. In the Joseon Yeoljeon Hall of Sagi, it was said that the letter was difficult to protect the border with Gojoseon in the early days, so the old border post was repaired and moved there. Since the letter inherited the territory of the Qin Empire as it was, this record shows that the border between Gojoseon and China was located west of the Nanha basin before the Qin-Han Dynasty. The border between Gojoseon and China was generally formed of Nanha and Galseoksan Mountain, sometimes far west of it. In the Dongiyeoljeon Hall of "Huhanseo," he explained about Ye and said, "Ye, Okjeo, and Goguryeo were all originally Joseon's land." This is the situation after the Gojoseon collapsed. At that time, Yeh occupied parts of the current Hamgyeongnam-do and Gangwon-do, Okjeo occupied Hamgyeongnam-do and Hamgyeong-do, and Goguryeo occupied Pyeonganbuk-do, southern Gilin Province, and eastern Liaoning Province in China. It is said that all of these areas were land of Gojoseon. It is said that several countries, including Biryu, Shira, Goguryeo, Namokje, Bukokjeo, Ye, and Mac, including Han (Samhan) and Buyeo, inherited the Dangun of Gojoseon. This suggests the possibility that these areas were the territory of Gojoseon. Buyeo had the same customs as Goguryeo and other countries on the Korean Peninsula, according to the "Huhanseo" Dongiyeoljeon Hall and the "Three Kingdoms" Ohhwanseon Bidongjeon Hall. For example, when there was a ritual for Jecheon in the country, people from all over the country gathered to drink, eat, and dance every day, and this was called Yeonggo in Buyeo, Alliance in Goguryeo, Mucheon in Dongye, and May and October in Han. Buyeo had most of the same things as Goguryeo, including language and laws, and the people of Goguryeo thought it was a separate species of Buyeo. In order for the Gojoseon people, the central power of the founding of Silla, religion, language, and customs to be the same, they must live together for a long time in the same country and have deep cultural exchanges. Gojoseon is the only country that could encompass all of these regions before several countries, such as Buyeo and Goguryeo, became independent countries. From this, it is thought that the Buyeo area was also included in the territory of Gojoseon. Buyeo had Eolgunaha, which forms the border between China and Mongolia today, and the Heukryonggang River, which forms the border between China and Russia, as the north and northeast borders. Therefore, the northern and northeastern borders of Gojoseon would have been the same. In the geography of Goryeosa Temple, there is Chamseongdan Altar on the ridge of Manisan Mountain in Ganghwado Island, and it is said that Dangun held a memorial service to heaven, and Jeondeungsan Mountain is also called Samrangseong Fortress, so Dangun ordered three sons to build this castle. These ruins are still handed down with such legends. This shows that the Gyeonggi-do area was the territory of Gojoseon. In the Silla Bongi, Samguksagi, it was said, "In the old days, the people of Joseon lived in the mountains and created six villages, and they became the strong six parts and became the central force of Silla's founding." After the collapse of Gojoseon, the remaining people formed the sixth part of Jinhan and became the central force that founded Silla. In the past, some scholars believed that the central force of the founding of Silla was those who migrated from the north. Since Gojoseon thought it was in the basin of the Daedong River, he thought that the refugee should have migrated from there. However, in Samguksagi, it was described as "the remaining people," but not as "the flowing people." They were the sixth part of Jinui and became the central force of the founding of Silla. Jinhan is the name of the region during the Korean (Samhan) period before Silla was founded. From this, it can be seen that they have been indigenous forces who have lived in the area for a long time with considerable foundation. In this way, it should be considered that the current Gyeongju area where Silla was founded was the territory of Gojoseon. As mentioned earlier, there was a ritual for May and October in Korea (Samhan), such as Buyeo's Yeonggo, Goguryeo's alliance, and Dongye's Mucheon. The rituals and customs performed during that period were almost the same.

This identity of religious customs is formed only by living together in the same country for a long time and sharing it. In Han (Samhan), there was a heavenly army in charge of ancestral rites to God in Guk-eup, and there was a religious holy place called Sodo in the Geoguk (Jehuguk), where large trees were erected, bells and drums were hung and ghosts were served. This is an inheritance of Gojoseon's religion. According to the Dangun myth, there was a religious holy place called Shinshi in Gojoseon, where there were shrines and shrines. Sodo is similar to this. It should be seen that the above various facts indicate that the Han (Samhan) region was also included in the territory of Gojoseon. Han (Samhan) was located in the southern part of the Korean Peninsula and occupied the southern coastline. It was said that several countries, including Han (Samhan), inherited the Dangun of Gojoseon during the "King Ungi" Hansa-gun and the Yeolgukgi, but from the various circumstances discussed above, it should be considered that it encompassed the territory. Therefore, it should be considered that the southern border of Gojoseon was the southern coastline of the Korean Peninsula. To sum up what has been considered so far, the border of Gojoseon was formed by the current Nanha and Galseoksan Mountain in the west, Eolgunaha in the north, Heukryonggang River in the northeast, and the southern coastline of the Korean Peninsula in the south. Gojoseon was a large country with the current Korean Peninsula and all Manchuria as its territory. This fact is also supported by archaeological data. Tombs using stone materials such as Jeokseokchong, Seokgakmyo, and Seokgwanmyo, and Bifa-shaped Donggum, a representative weapon of Gojoseon, are found only in Manchuria and the Korean Peninsula in the east, and are not seen in China in the west. This allows us to know that Manchuria and the Korean Peninsula in the east of Nanha belonged to the same cultural area and the same ruling area. However, at the end of the Gojoseon Line, there was a change in the western border. In the 190s before AD, Wimanjoseon was established from the downstream basin of Nanha to the Daerungha basin, and the western border of Gojoseon became the Daerungha basin, and then Hansa-gun was established in the current Yoseo area in 107 AD. ■ The first literature to use the name "Chosun" and "Samguksagi" compiled by Kim Bu-sik and others during the Goryeo Dynasty are the first in Korea. During the reign of King Chungnyeol of Goryeo, Zen master Ilyeon wrote the name Gojoseon in Samguk Yusa. · It is the first time that a book called "Gwanjia" was written by the governor of the Qi Dynasty during the Spring and Autumn Period of China. Since then, records of Joseon have been shown in Sagi and Sangseo.