Phong Nha–Kẻ Bàng National Park

This park is in Vietnam.

It sits near the sea. It is also near Laos.

The park has many caves. It has 300 caves. One cave is the biggest in the world.

The land is made of rock. This rock is called limestone. It is very old. It is the oldest in Asia.

The air is hot and wet. It rains a lot there. Many trees grow in the forest.

People can visit the caves in boats. It is a very special place.

Phong Nha–Kẻ Bàng National Park is in Vietnam.

It sits in the center of Quảng Bình Province. The park is near the East Sea. It also borders Hin Namno National Park in Laos.

This park is a very special place. It is a UNESCO World Heritage Site. This means it is a place of great value to the world. The park is famous for its many caves. There are 300 caves and grottos there. One cave is named Sơn Đoòng. It is the largest cave in the world.

Another cave is called Paradise Cave. It is very big and beautiful.

The land is made of limestone. This is a type of rock. The limestone here is very old. It is the oldest major karst area in Asia. Karst is a type of land made of limestone. It has many hills and deep caves.

The weather is hot and humid. This means the air feels wet. It rains a lot in this region. Many green trees grow in the limestone forests. You can even see boats on the water in the caves.

Phong Nha–Kẻ Bàng National Park is a special place in central Vietnam.

It sits in the Quảng Bình Province, about 500 km south of Hanoi. The park is near the East Sea and the Annamite Range. To the west, it borders the Hin Namno National Park in Laos.

This area is part of a huge limestone zone. The park covers 857.54 square kilometers of land. It is a UNESCO World Heritage Site because its geology is so important.

The park is famous for its amazing cave systems. There are about 300 caves and grottos to find.

One very special cave is called Sơn Đoòng. It was found in 2009 by British and Vietnamese explorers.

This cave is the largest in the whole world. Its biggest chamber is over 5 kilometers long. It is also 200 meters high and 150 meters wide. Other beautiful places include Paradise Cave and the fairy-tale Tien Son cave.

People have known about these caves for a very long time. In the 9th century, people left carvings in the caves.

These carvings were on Buddhist altars and stone slabs. The Phong Nha cave was even mentioned in books in 1550. Later, a French priest named Léopold Michel Cadière explored the area. He called Phong Nha the number one cave in Indochina.

In 2003, the park became a World Heritage Site to protect it.

The landscape here is made of very old limestone. This is called a karst landscape.

This karst area is the oldest major one in Asia. It started forming about 400 million years ago. The land has changed many times due to the Earth's movement.

You can see tall mountains that rise over 1,000 meters. Some peaks, like Co Preu, are even taller at 1,213 meters. The ground has many shapes like towers, valleys, and deep holes.

The weather in the park is tropically hot and humid.

This means the air feels very wet most of the time. It rains a lot, especially from July to December. The temperature stays warm, but it can get cooler in the winter.

Because it is so wet, many green trees grow in the limestone forests. This helps many different living things survive there. Visitors can even take boats to see the underground rivers.

Phong Nha–Kẻ Bàng National Park is a significant protected area in central Vietnam.

It is located within the Quảng Bình Province, specifically in the Bố Trạch and Minh Hóa districts. The park sits about 500 km south of Hanoi and roughly 260 km north of Đà Nẵng. To the west, it shares a border with the Hin Namno National Park in Laos.

This park is a UNESCO World Heritage Site. It was recognized in 2003 for its exceptional geological values. The park serves to protect the biodiversity of the Annamite Range limestone forests. It also preserves one of the two largest karst regions on Earth.

Geology is the foundation of this landscape. The area is characterized by a complex karst landscape. Karst refers to landforms created by the dissolving of soluble rocks like limestone.

This specific karst region is the oldest major one in Asia. It began evolving during the Paleozoic era, approximately 400 million years ago. The landscape has undergone seven different stages of karst development. These stages resulted from tectonic uplift and changing sea levels. Massive tectonic changes and hydrothermal action have also shaped the terrain. This process created a high level of geodiversity across the park.

The park contains various types of landforms. Scientists divide them into non-karstic and karstic groups. Non-karstic landforms include dome-block mountains and mountain belts made of terrigenous rocks. Karstic landforms are divided into surface forms and underground forms. Surface karst includes features like cone and tower karst, valleys, and dolines.

Underground karst consists of the massive cave systems. The park also features many high mountain peaks. About two dozen peaks rise above 1,000 meters. Notable summits include Co Preu at 1,213 meters and Phu Tạo at 1,174 meters. These mountains form a continuous range along the border with Laos.

The cave systems are the most famous feature of the park. There are approximately 300 known caves and grottos.

A 2009 survey identified a total cave length of about 126 km. Many areas within these systems remain unexplored. One of the most significant discoveries was Sơn Đoòng Cave in 2009.

This cave is the largest in the world. Its largest chamber is over 5 kilometers long, 200 meters high, and 150 meters wide. This discovery allowed it to overtake Deer Cave in Malaysia for the title. Other notable sites include Paradise Cave and the Tien Son cave. Tien Son is also called the Dry Cave because it lacks an underground river.

Human history is deeply connected to these caves. Champa inscriptions on steles and Buddhist altars date back to the 9th century.

This shows people lived there long before the area was annexed by Vietnam. The Phong Nha cave was mentioned in literature as early as 1550. In the 19th century, a French priest named Léopold Michel Cadière explored the area. He described Phong Nha as the number one cave of Indochina. In 1924, an English explorer named Barton compared it to famous caves in France and Spain. These historical records show the long-standing importance of the region.

Modern exploration changed how we understand the park. A turning point occurred after 1990 when exploration shifted toward scientific research.

In 1990, Hanoi University began cooperating with the British Cave Research Association. Howard Limbert led the first major expedition. In 1992, a group of 12 British scientists and six Vietnamese professors explored 7,729 meters of Phong Nha Cave. They also explored 13,690 meters of Vom Cave. These efforts provided the data needed for the UNESCO World Heritage nomination. In 2005, scientists discovered Paradise Cave, calling it the most beautiful in the area.

The environment is tropical, hot, and humid.

The annual mean temperature is 24.5°C. Summer temperatures can reach 36°C, while winter temperatures can drop to 16°C. Rainfall is heavy, with about 2,600 mm falling each year. Most of this rain occurs during the monsoon from July to December. The average relative humidity is 84%. This wet climate supports the lush limestone forests. These forests are home to rare species and diverse flora and fauna. Visitors often explore the area by boat through estuaries or underground rivers.