The five thousand years of ancient Chinese history is actually a history that must be divided for a long time and must be divided for a long time. Especially when the dynasty is strong, the territory is constantly expanding, especially the peripheral expansion is very large, and when the dynasty is weak, in the face of external invasion, the land is constantly lost, which eventually causes the country to shrink. In modern times, it is the most typical, coupled with the fact that ancient China regarded itself as a heavenly kingdom and had a very low concept of territory. In particular, the border division is not clear, resulting in a lot of land being occupied in modern times, the most typical is the huge lake of 4380 square kilometers below, when will it be able to return to the motherland? You might not think of it.

During the Qing Dynasty, although the territory expanded widely, it especially strengthened its control and rule over the northeast, northwest, and southwest. However, the system of allegiance is still continued, and in many regions, no clear boundaries are drawn from the neighboring countries. Therefore, in modern times, huge problems arose, and the border land was arbitrarily occupied by the great powers, forming a disputed border, or directly occupying it.
Especially in the northeast region, the loss was the worst, losing more than one million square kilometers of land, the most unfortunate of which was Xingkai Lake. Xingkai Lake is the largest lake in northeast China, with a total area of 4380 square kilometers, and has always been an inland lake in China. Moreover, for a long time in the hinterland of the northeast, it has abundant water resources, which can be said to be the key to irrigation and fertility of the northeast.
Because the Manchu Qing originated in the northeast, after the Manchu Qing entered the customs, the northeast was almost no man's land, resulting in a weak ruling force. Therefore, when Tsarist Russia continued to expand into Asia in modern times, when it reached Siberia and the Outer Northeast, as well as the Outer Hing'an Mountains, and Sakhalin Island, it was like entering no man's land.
Therefore, under the pressure of the army, starting in 1860, Tsarist Russia took advantage of the successive defeats of the Qing government in the Opium War and forced the Qing government to sign a treaty to occupy a large area of land in the northeast. Among them, Xingkai Lake also accounts for the majority, accounting for two-thirds. Moreover, in the form of a treaty, it was directly determined that only one-third of the north of the huge Xingkai Lake was left, and as a water source in the northeast region of China, China began to lose most of the Xingkai Lake.
So when will the huge lake of 4380 square kilometers be able to fully return to the motherland? You might not think of it. In the short term, the current world pattern is basically determined, and China and Russia have also completed the demarcation, so basically nothing can be changed. However, in the long run, the historical cycle will not change, and it will be united for a long time. Russia's future population will continue to decline, especially in the Far East and Siberia, with almost no population, just like china's modern northeast.
Therefore, once Russia becomes a third-rate country in the future, especially when it is unable to control a huge land, then this Xingkai Lake will be combined for a long time and will be gradually realized. In the long run, when China's national strength continues to increase, it has become the world's first again, and it has dominated the world pattern, that is also the time when our country continues to recover the lost land, let us wait and see. What do you readers think about this? Welcome to leave a message and discuss with the editor!
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Reference: Modern and Contemporary World History.