Explore the world’s largest funnel Chuandongan

Chuantongan is located at the foot of Chuanzhu Mountain, 42 kilometers east of Guangyuan City, Sichuan. It is located in the limestone karst cave group at an altitude of 1400 meters. It is one of the largest tiankengs discovered in the world. Because of the old Chuanzhu Temple on the top of Chuanzhu Mountain, the local people called it “Chuandong Temple”.

The locals who have seldom walked out of the mountains for generations did not know that this place regarded as a treasure of feng shui turned out to be a geological wonder of the world. Chuandong Temple is located in a virgin forest, and its natural scenery is very unique. Entering the scenic spot is dense jungle, entangled with vines. Winding and winding down from the top of the mountain, down thousands of steps down to the bottom of the deep valley of Chuandongan.

Chuandong Nunnery has plenty of rain, the clouds cover the fog all year round, and the water gurgling. Looking at the smoke and flowing water from afar, it is like a huge Bai Lian hanging in nine days. The air here is exceptionally fresh and unstained, and the air is filled with wet and refreshing. There are hundreds of wild plants here. Walking into Chuandong Temple is like entering a wild botanical garden.

There are dozens of animals in the scenic spot, such as fox, hedgehog, wolf, wild boar, leopard, pheasant, etc. These animals have lived in harmony with the mountain people for a long time. When they see the mountain people, they do not panic or hurt people. Hundreds of pheasants have lived on the mountain for many years. In the late spring and early summer, pheasant eggs were everywhere, but no one picked them. The egret rises and falls among the green hills and the green water, and quacks and cheers, adding a lot of vitality to the quiet scenic area, forming a unique landscape.

What is even more amazing is that at the bottom of the funnel there is the endangered plant known as living fossil-yew; the leaves are like a bowl, and the flower is the heart of the honeysuckle; the “thousand-layer tree” is shaped like a pagoda.

Into the “big funnel”
The walkway from Chuandongan to the Tiankeng is paved with stones and wood. Tourists are taking a single cycle route, and will definitely not go the wrong way. Because only by going all the way down can you reach the biggest “hole” at the bottom of the Tiankeng.

Suddenly, the word “Smoke Cloud Cave” was faintly seen in the distance. In the depths, there is nothing. The Yanyun Cave is a half-moon-shaped cave formed by the erosion of the underground river, with an area of ​​about 400 square meters. The cliff of Yanyun Cave is rugged, and a waterfall falls at the top, like a string of jade beads hanging down. Inside the unfathomable cave, there are many stalactites in various shapes and shapes. At the bottom of the cave, the sound of water roaring can be heard but there is no running water. It turns out that the dark river water is connected to the “Feitian Palace” not far away.

Whenever the sun is shining high or flying down straight, being in it is like a fairyland on earth. Because of the humid climate, the moss in the cave is deeply spread, and the soft, rug-like blankets are stepped on.

I walked all the way to the bottom of Chuandongan funnel. After walking for about half an hour, I saw the entrance of the cave. The entrance was not too big. I only saw a strong beam of light from the top to the bottom of the cave and stepped into the cave. I suddenly realized the true meaning of the four words “Don’t have a cave”. The cave is divided into three layers, with a length of about 650 meters, a depth of about 670 meters, and a volume of about 220 million cubic meters. It is really huge.

According to research by relevant departments, the Chuandongan funnel is a Cretaceous stratum, which is composed of two levels of funnel. Among the known world-class big funnels, it is larger than the dragon cylinder big funnel with a volume of 119 million cubic meters in Fengjie County, Chongqing. It is nearly ten times larger than the American Alibaba funnel with a diameter of 330 meters and a depth of 70 meters, known as “the world’s largest”. It seems that its “world’s first” is genuine!

Later, it was discovered that there is a sky pit about 100 meters deep on the floor where tourists walk. It is a huge karst cave that can accommodate thousands of people. This is the main character of Chuandong Temple, “Feitian Palace”. .

Feitian Palace is located in the stone wall next to the east of the bottom of the tiankeng, 50 meters high. It is an independent mountain-crossing cave connected to the main tiankeng, and it is also the lowest point of the tiankeng tiankeng. The water dribbled down the skylight in the cave, and it was scattered into the mist. Looking up on a clear day, a beam of sunlight was directly emitted from the huge circular pierced hole naturally formed on the top of the cave, forming a 100-meter beam. Through the beam, the blue sky and white clouds were clearly visible The rainbow between the water and mist is colorful, and the jade beads are falling, which is quite spectacular.

The sky above the top has a mountain spring pouring in. When the sun is shining, the gas in the cave rises like a dancing fairy rising to the sky.

Speaking of Chuandongan, we must mention the funnel group here. Chuantongan has 12 funnels of various sizes, including various types, and can be called a natural “funnel museum”.

From the bottom of the pit, along the steps paved with wood, turn around and go up the stairs. Looking back at Chuantongan Tiankeng, large and small funnels are very spectacular. In this funnel group, the largest funnel accounts for more than 90% of the entire funnel group. The funnel wall is more than 90 meters, and the surrounding rocks are cut like an axe, forming an upright cave, like a big mouth open to the sky.

In ancient times, it was a battleground for military strategists
Because the wind and cold inside the tiankeng are not easy to invade, the temperature is quite different from the outside. At the beginning of early spring, the mountains are often snow-capped, and wildflowers in the pit begin to bloom. Villagers also use the temperature difference to grow some vegetables there and enjoy them all year round.

Chuantongan is a typical karst karst landform, integrating geological collapse, underground karst caves, and underground rivers. After hundreds of millions of years of geological evolution and complex geographical environment changes, the limestone has been squeezed by external forces during geological activities. Pressure, the fracture collapsed to form the present unique landscape. In 2014, “China National Geographic” selected Chuandong Temple as “the most beautiful scene in Sichuan.”

Chuandongan Mountain has high forest density and hidden terrain, which has always been a battleground for soldiers. Historically, there have been three major wars here. In the second year of Jiaqing in Qing Dynasty (AD 1797), Wang Cong’er, leader of the Chuanchu peasant uprising army, led a large army stationed in the cave to resist the Qing army. With the dangerous terrain and tenacious fighting spirit, the Qing army failed to conquer and resist the Qing army. Zhaimen and the fort still have caves.

Interestingly, this is also a secret place for the Red Army to discuss matters when it first established a base in the Zengjia area. In June 1933, Xu Qiang’s troops once held a secret military meeting at the platform of Chuandongan Wangwang, and formulated an action plan for “clearing bandits, reducing rents, and establishing Soviets.”