What are the four passes of Shu in the Three Kingdoms?

Yangping Pass, Jiameng Pass, Guanfu Pass and Mianzhu Pass are four major passes. Yangping Pass is in the north of Hanzhong, and Mianzhu Pass is closest to Chengdu. When it comes to the difficulty of Shu Dao, people can't help reciting Li Bai's poem "Difficult Shu Dao": "Oh, it's very high and dangerous! ! Such a trip is more difficult than climbing the blue sky. ..... And Dabai Mountain, to the west, still has only one bird path, all the way to the peak of Emei. It was once broken by an earthquake, and some brave people lost it, but only completed the stone steps of the ladder leading to heaven ... Green Mud Mountain is made up of many circles, and for every hundred steps, we have to turn nine times in the middle of its mound ... Although the Diaolouguan is firm and dangerous, one person can keep it, and ten thousand people can't break it ... "It tells the historical story of digging the Shu Road, making the steep Shu Road famous all over the world. The so-called "Shu Road" refers to the road from the Central Plains to Bashu (Qin to Shu) in ancient times. It is mainly a multi-section plank road opened between cliffs, which is called "the plank road is a thousand miles away." North of Hanzhong in Shaanxi is the northern section of Shulu Road, which mainly includes Xiexie Road, Chencang Road, Lu Road and Ziwu Road. Hanzhong-Chengdu section is the southern section of Shu Road, mainly including Jinniu Road (also known as Road), Jialing Old Road, Baishui Road and Road. Fuxian (Mianyang) is at the intersection of Jinniu Road and Yin Ping Road. There are many stacks, passes, places of interest and stories on the Shu Road. The plank road was a unique mode of transportation in some ancient areas of China: caves were dug at a certain distance on the cliffs or river banks, big wooden beams were inserted horizontally on the caves, holes were dug in the cliffs and canyons below them, trees were inserted as the pillars of the beams, and boards were laid on the wooden beams to form a volley road for people to pass. Some plank roads are also equipped with railings and covered with ceilings, such as pavilions on cliffs, so they are also called pavilion roads. It is attached to the cliffs, and the clouds are lingering; Lingju is located in a fast-flowing river, very steep. Ancient times called Shu Road "Flying Pavilion" and "Cloud Stack" and described it as "plank road connecting clouds". Just like the Great Wall and the Grand Canal in Wan Li, QianLi Shu Road is a great creation, and it is a symbol of the diligence and wisdom of the Chinese nation. There are many passes in Shu Road, which can be described as adding risks and making the finishing point. Chengdu is the end of Shu Road (and the names of Jinniu and jinniu district). From Chengdu to Hanzhong, there are Mianzhu Pass, Baima Pass, Guanfuguan Pass, Wakouguan Pass, Jianmenguan Pass, Baishui Pass, Jiamengguan Pass, Tianxiong Pass, Feixianguan Pass, Chaotian Pass, Yangpingguan Pass and Chessboard Pass. The first is Mianzhuguan (now Xu Huang), which is located at the northern end of the western Sichuan Plain, near the mountainous area. Wei smuggled Wargo into Yin Pingchuan, and Zhuge Liang's sons Zhuge Zhan, Sun and Zhuge Shang fought Deng at the last pass, both of whom died. Chengdu has no danger to defend, and Shu Han dies. Baimaguan, also known as Lutouguan. When Liu Bei took the northwest, Pang Tong, the strategist, changed horses with Liu Bei. At the time of tackling key problems, Zhang Ren, the Ministry of Liu Zhang, shot and killed him. Today, there are Pang Tong's tomb, shrine and Fenghuang slope, and Zhang Fei points out Taiwan Province's historic sites; There is also the battlefield where "Kong Ming planned to arrest Zhang Ren", and the tomb of Zhang Ren near Luojiang. Guanfu, Fucheng, is located between Fule Mountain and Dayin Mountain. Liu Bei took him to give up to meet Liu. There are many relics in the Three Kingdoms: Fuleshan, Fuletang, Jiangwan Tomb, Yingpanzui (where Jiang Wei stationed troops), Qibaoliang (where Zhuge Liang stationed troops to practice the water army, also known as Fushui Zhuge Ying), Wulidui (where Zhang Fei stationed troops), Yinmadu (now Mashangqiao), and Zhangfei's drinking horses ... Wakouguan is located on the Jinniu Ancient Road, 5 kilometers north of Zitong County. Zhang Fei led the troops here, leaving two footprints in front of the pass. Jianmenguan, in the north of Jiange County. The 72 peak of Dajianshan is interrupted here, and the two peaks confront each other, forming a natural narrow pass overlooking the city gate. Along the ancient road, there are Jiang Wei's tomb, Deng Ai's father and son's tomb, Wuhoupo, Wuhou Bridge, "Cuiyun Gallery", Zhang, Zhang and Adoubai. Meng Jiaguan, with Zhao Huacheng as the pass. After Jiang Wan, Fei Yi presided over the stationing of troops in the government, set up a government, and was buried on the spot after his assassination. In Yafu Village, Guan Yu's third son, Guan Suo's wife stationed troops here to build a city and died in the battle with Wei General Pang Hui. There is Bao San Niang's tomb. Tianxiong Pass is located on the mountainside of Niutou outside Zhao Hua. There is also Guandi Temple, which is actually the temple of Liu, Guan and Zhang. Chessboard Pass, located 59 kilometers north of Guangyuan. It is the junction of ancient Qin and Shu, and Jinniu Road passes through the customs. Existing "the first pass of Western Qin Dynasty" stone carving, and the remains of closing the door can be distinguished. Chaotianguan is located in Chaotian Town, 25 kilometers north of Guangyuan, which was called Chaotian Gorge in ancient times. There are tiger's mouth, "Qingfeng Gorge" and "Yuemingxia" plank roads, and the terrain is dangerous. Yangpingguan is located in the old town of Mianxian County. Zhuge Liang once defended this pass in the Northern Expedition. There are Baishui Pass and Jiangyou Pass (Nanba) on Yin Ping Road. Every level has tragic stories and relics of Shu and Han in the Three Kingdoms.