As can be seen from the map, the territory of the Yuan Dynasty has actually reached the coast of the Arctic Ocean, which should be the area under the jurisdiction of Lingbei Province and Liaoyang Province at that time. If we can find records about local rivers in the historical documents of the Yuan Dynasty, we can determine the territory of people in the Yuan Dynasty at that time. The existing Record of the Unification of the Yuan Dynasty? Liaoyang Province is a mixed river. The first four rivers, the Yalu River, the Hunhe River, the Sea of Japan and tatar strait, flow south.
If the northeast can't reach the so-called Arctic Ocean, as the basic disk of Mongolia, can Lingbei Province enter the Arctic Ocean? In this regard, the academician's introduction is very vague. "So that land is Yinbei Mountain, which flows west, faces Liaozuo in the east and faces the sea in the south." As we all know, the concept of Yinshan Mountain is basically absent in today's Mongolian Hetao area. Because the Mongolian highlands and the Mongolian plateau obviously belong to the Yuan Dynasty.
In the Yuan Dynasty, Guanshui had the Shi Jing Grand Ceremony, and the northern territory was bounded by the "Northern Court Returning to the House", which belonged to the nine provinces of Tiele in the Tang Dynasty. The territory of Hui-Fu Han established by it was basically located in today's Lake Baikal and Tangnu Wuliangshan. Where did the northern border of the Yuan Dynasty go?
Today, many people quote Sheng Ruzi's Study on Old Scholars. The northernmost part of the territory of the Yuan Dynasty is Angkor in Lingbei Province. Among them, Angkor Wat is the homonym of Angara River in the upper reaches of Yenisei River in Russia today, that is, the homonym of Angara River.
In addition, in Raster's masterpiece Historical Records of Mongolia, the Persians who knew something about Mongolia were a large number of Turks in northern Mongolia at that time. The aborigines living in the middle and lower reaches of Yenisei River after the Middle Ages are Uralic languages such as Osyak and Nenets. People in the Yuan Dynasty obviously didn't communicate with these people, or even met them. On the other hand, Guo Shoujing, a scientist in Yuan Dynasty, conducted a nationwide scientific experiment of observation between Japan and Britain. The results show that many people think that Beihai movies are located on the coast of the Arctic Ocean.
However, according to the coordinates of the North Sea Observatory, "The North Pole is 65 degrees above the ground, and the summer solstice shadow is 6 feet 7 inches 8 minutes, 82 minutes during the day and 18 minutes at night", at that time, the position of the North Sea Observatory was basically determined to be about 63 degrees north latitude, and the territory actually controlled was about 60 degrees north latitude at most.