Guanzhong Mountain River is four stops, there are Qinling Mountains in the south, Longshan Mountain in the west, Loess Plateau in the north, Huashan, Kunshan and the southwest mountains of Shanxi Province in the east, and the Yellow River surrounds, which can be described as surrounded by mountains and rivers, and the momentum is reunited. In terms of topography, Guanzhong is a towering position in the eastern plains. There are mountains and rivers on all sides of Guanzhong, and several important traffic channels are guarded by the passes. Its important position is that Hangu Pass controls the danger of the passage between Guanzhong and the Central Plains; Wuguan controls the danger of the eastern section of the Qinling Mountains and guards the passage of entry in the southeast direction of Guanzhong; the danger of the western end of the Qinling Mountains is controlled by the scattered pass, which controls the choke point of traffic between Guanzhong and Hanzhong and Bashu; and the danger of Xiaoguan chokes Longshan and guards the northwest passage of Guanzhong. The four stops are dangerous, the retreat can be self-defending, and the exit can be aggressive. If the form shì is favorable, it will go out of the customs and forge ahead, and if the form shì is unfavorable, it will be closed and self-controlled. So that the Guanzhong can advance and retreat, and can attack or defend. This is also the foundation for Qin, Han, Zhou, Sui and others to finally win the world. ”

Hebei is surrounded by mountains and seas, surrounded by mountains and seas on three sides, and the Central Plains in the south. The Yanshan Mountains play a role as a barrier against the southward movement of the nomads from the north, and the security of Hebei and even the entire Central Plains. Jundu Pass, Linyu Pass, Songting Pass, Beikou, Lengkou, Lulong and other passes, guarding several traffic channels through the Yanshan Mountains. The Taihang Mountains are an important barrier on the right flank of Hebei. Flying Fox, Jingcheng Pass, Fukou and other passes guard the passage through the Taihang Mountains. In the hinterland of the Hebei Plain, there are some east-west rivers, such as Juma River, Hutuo River, Zhangshui River, etc., which can resist the threat from the south and provide a strong gateway barrier. ”

"The defense pattern of the Jianghuai River is a multi-level defense system based on the Yangtze River and the Huai River. The confrontation between the north and the south, the south mainly relies on the Yangtze River and the Huai River. The formation of some important military towns in the south was based on this. The Yangtze River runs through Bashu, Jingxiang in the middle, and Wuyue in the bottom, running through the east and west, stretching for thousands of miles, and the upstream and downstream echo each other, so that the shape of the entire southern region can be complete; in addition, the Yangtze River itself plays the role of a moat against the impact of the iron cavalry in the north. Historically, with the growth and decline of the forces of the north and the south, the offensive and defensive momentum has also changed, and when the south is strong, it can advance out of the Huaibei and enter the Central Plains; when the south is weak, it will often retreat to the Yangtze River; and when the north and the south are evenly matched, they will often take the Huai River as the front line of confrontation. ”

"Bashu is located in the upper reaches of the Yangtze River basin, which is a typical basin topography. In every direction of the basin's periphery, there are lofty mountains, and the thickness of its protection is not comparable to other regions. The Three Gorges of the Yangtze River is the passage between it and the east, and the valley lowlands of the Jialing River and its tributaries are the passage between it and the north. The passage between the two directions is extremely dangerous. The east side is the waterway and the river road, and the north side is the land road and the plank road. It has always been a dangerous place, easy to defend and difficult to attack. ”

"According to the four corners of the mountains and rivers, most of them can achieve a hegemony. Li Jiancheng said slowly, "It's just that Bashu is too comfortable, and it is okay to divide one side, but there is no possibility of winning the world; Those who win the world are only related to China and Hebei. Occupy Guanzhong and win the world, such as Liu Bang, and occupy the land of Hebei and win the world, such as Liu Xiu!"

Mrs. Dongming nodded, it is true, the four corners of the land have a common feature, that is, they live in the four corners, and they can attack and retreat.

Among them, Guanzhong and Hebei are the best, while Bashu and Jianghuai are not expected much.

After a pause, Li Jiancheng continued, "Hedong, Shandong, Jingxiang and Hanzhong are on the four sides. Most of the four sides also have more dangerous mountains and rivers, but these regional conditions are not as good as those in the four corners. Sandwiched between two corners, they are both the link between the two sides and the focus of contention in the confrontation between the two sides. They have a relatively close passage to the Central Plains. In the past dynasties, the forces that arose in the four corners wanted to get rid of the hegemonic situation of separating one corner and expand outward, they must first fight for two wings and control both sides of the corner. ”

"Hedong has the status of a pivotal surname in the whole north. The main body of the Hedong topography is composed of a series of bead-shaped basins sandwiched between the mountains on the east and west sides. The Taihang Mountains in the east constitute the western barrier of Hebei, and the Luliang Mountain, Zhongtiao Mountain and the Yellow River in the west constitute the eastern barrier of Guanzhong. The distribution of mountains and rivers in Hedong is intricate, forming a series of small basins. The topography of these basins is relatively closed, becoming a small area with relative reading power. In these small areas, a number of important military towns and important passes were formed. They are oriented in different directions and show different strategic significance. The mountains and rivers of Hedong make Hedong have an extremely favorable position for internal operations. The terrain to the east of the river is high enough to overlook three sides, and several traffic channels leading to the outside are mostly conducive to going out and not conducive to attacking. This is a favorable condition for Hedong's internal operations, and it is also the geographical basis for the formation of Hedong's position as a hub in the north. The Xiongnu Liu Han's battle to destroy the Western Jin Dynasty, the rise and fall of the Northern Wei Dynasty in a hundred years, and the change of the Zhou, Qi, and Sui dynasties can all illustrate Hedong's pivotal position in the north. ”

"The significance of Shandong's topography lies in the fact that it is particularly prominent on the Great Plains of the Central Plains. The main body of Shandong's topography is the low mountains and hills in central and southern Shandong, with plains on three sides and the sea in the east. Some important military bases in Shandong are basically distributed on the four sides of the low mountains and hills in central and southern Shandong, and most of them are located near mountains and rivers, controlling one side. The Yellow River runs from east to west in the northern region and is a major traffic artery between the east and west. The Grand Canal runs north-south on the eastern plain, and is the main traffic artery between the north and the south, and Shandong is at the intersection of these two major arteries. In addition, the Shandong Peninsula is a major transit point for maritime transportation. Shandong is especially in the position of a hub between the north and the south. Now when we are confronting the north and south of Nanchen, Shandong is the focus of our contention. ”

"Jingxiang lives in the middle reaches of the Yangtze River, and occupies a pivotal position between the upper and lower reaches. There are stretches of mountains on the periphery of Jingxiang to make it dangerous, and there are large rivers leading to the outside of the country, thus forming its strategic position of "the country of force". Tracing up the Yangtze River from Jingxiang and crossing the Three Gorges is one of the main passages into Shu; if there is a confrontation between the upper and lower reaches, Jingxiang can stop the eastward exit of the forces in Sichuan. Jingxiang lives in the upper reaches of the southeast, based on the power of Jianghuai, and all rely on Jingxiang as an upstream barrier. Since ancient times, there has been no one who has lost Jingxiang and can keep Jianghuai. The Western Jin Dynasty destroyed Sun Wu and the Sui Dynasty destroyed Chen, and the situation was opened from the upper reaches of Jingxiang. ”

Hanzhong, one of the four sides, is the Qinling Mountains and the Daba Mountains sandwiched between the Hanshui River Valley to form the main body of Hanzhong's topography, the two mountain ranges stand in parallel, stretching from east to west, and Hanzhong is sandwiched between them. There is Wuguan at the east end of Qinling, there is Sanguan at the west end, and there are three other valley roads, which can be the passage between Hanzhong and Sichuan, they are Bao Slope Road, Fu Luo Road, Meridian Road. Between Hanzhong and Sichuan, there are also two valley roads that cross the Daba Mountains: the Jinniu Road and the Micang Road. Hanzhong is sandwiched between the two upper reaches of Guanzhong and Sichuan, and the competition between Guanlong and Bashu has always been the most fierce not in Qinling, but in Hanzhong. ”

Li Jiancheng said: "There is also a hint of the possibility of competing for the world and winning the Central Plains on the four sides. However, the key lies in whether or not we can compete for the next corner as a basis, and then compete for the next side, forming a force on both sides of one corner, and then there is the possibility of three layers and winning the world, and there is a possibility of five layers standing on top of each other!"

"In the competition for the world, no matter which corner or the political forces on that side, only by forming a situation on both sides of one corner can we get rid of the hegemonic pattern and expand outward. If it's done right. In terms of defense, it can consolidate its defensive posture, and in terms of offense, it can encircle the Central Plains and forge ahead into the world. ”

Mrs. Dongming said: "Shizi, it is said that it is a battle for the corners, and it does not involve the dispute of the Central Plains, but Li Mi has no hope! Recently, the Wagang army has defeated Zhang Xutuo, and its prestige is great!"

Li Jiancheng said: "It has always been a struggle for hegemony in the world, and the north often dominates the south, and whoever wins the north can unify the world." The dispute between the north is often the dispute between Guanzhong and Hebei. The most important thing in the competition between Guanzhong and Hebei lies in the competition in Hedong. Those who get the east of the river will get the north, and those who get the north will get the world. ”

"Phnom Penh, Silver Horn, Grass Belly! The four sides and four corners are all real strategic places, but in the troubled times, the Central Plains is not a good place, and there are few who rely on the Central Plains to finally succeed in winning the world. The Central Plains is located in the Quartet, which can be combined with the whole situation of the world. The Central Plains is a place that extends in all directions and is the hub of the four parties. It is very convenient to go from the Central Plains to the surrounding areas, and from the surrounding areas to the Central Plains. Its shape is closely related to the surrounding area. Incidents in the Central Plains will inevitably involve the Quartet, and if there are incidents in the Quartet, they will affect the Central Plains. If the Central Plains is in turmoil, then the squares will be scattered. However, at the beginning of today's turmoil, because the Central Plains could be attacked on all sides, the centrifugal force of the four sides was enough to tear apart the Central Plains, making the Central Plains a turbulent meeting place. The turbulent torrent was enough to wash away any effort to hold the Central Plains. ”

Mrs. Dongming's face changed slightly, the situation was already very clear, if the battle for the world was compared to a game, and Li Mizheng might be the first to quit.

At this moment, Li Mi laughed the most, but he couldn't laugh last.

Mrs. Dongming was a little unwilling and said: "Cao Cao also occupied the Central Plains back then, and at that time Cao Cao was still unifying the north!"

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