Phong Nha cave

The main Phong Nha cave includes 14 chambers, connected by an underwater river that runs for 1.5 km. Phong Nha Caves, like most of the caves in this area, has been continuously shaped by the Chay River.

phongnha-cave21 Phong Nha cave

Phong Nha Caves, like most of the caves in this area, has been continuously shaped by the Chay River. As one gets farther into the cave, the more illusory the stalactites and stalagmites look as they glitter when bright light is shone on them. The Son River flows into the mouth of the cave and keeps flowing underground, where it is referred to as the Nam Aki River, then this river emerges at a site 20 km to the south near Pu Pha Dam Mountain.
The main Phong Nha cave includes 14 chambers, connected by an underwater river that runs for 1.5 km. Secondary corridors branch off in all directions. The Outer Cave and some of the Inner Caves have roofs that tower between 25 and 40 meters above the water level. From the 14th chamber there may be other corridors leading to similarly large chambers, but this area proves more dangerous for explorers because of the ongoing erosion of the limestone of the cavern. The Shallow cave is located 800 meters from the cave mouth, where there is a spectacular landscape of sand and rock. Stalactites and stalagmites jut out like strange trees, exciting visitor’s imaginations.

Notable caves and grottos in Phong Nha Cave system

Dark Grotto

Dark Grotto located upstream of Son River running to the branch of Chay River on the left. This cave is 5,258 m long and with a height of 83 m. The entry is high and wide with heavy forest around the cave mouth.

E Grotto

E Grotto a 736 m-long grotto accessible by Ho Chi Minh Trail.En Grotto is  a 1645 m long, 78.6 m high grotto. The grotto is wide, there is fine sand field inside. This grotto is the habitat of thousands of sparrows.

Cha An Grotto

Cha An Grotto: a 667 m-long grotto, with the width of 15 m.
Thung Grotto: This grotto has an underground river of 3351 m, with the height in some part exceed 133 . This river receives water resources from Rao Thuong.

Khe Tien Grotto

Khe Tien Grotto: located south of Phong Nha, this grotto is 520 m long.

Khe Ry Grotto

Khe Ry Grotto: located south of Phong Nha. The grotto is where the stream Khe Ry (a 13.817 km or 8.585 mi (13.816 km) long stream at the elevation of 120 m, originating from a mount 1300 m high) runs out.

Khe Thi Grotto

Khe Thi Grotto: The Khe Thi stream originating from the mount and runs underground at this grotto.

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