Hang En - world’s third largest cave

As considered the world’s third largest cave by volume behind Son Doong cave, also in Phong Nha – Ke Bang National Park and Deer Cave in Malaysia, Hang En has recently become one of the most renowned and impressive caves on the planet (Photo: Oxalis Adventures/Vietnam+)

Deep inside the Phong Nha - Ke Bang National Park, the adventure tour to Hang En has been said to have the biggest ‘wow’ factor in all of Vietnam, with the most surreal camping experience (Photo: Oxalis Adventures/Vietnam+)

Hang En was first explored by British cave explorers in 1994 (Photo: Oxalis Adventures/Vietnam+)

These days the most accessible entrance to Son Doong passes directly through Hang En (Photo: Oxalis Adventures/Vietnam+)

(Photo: Oxalis Adventures/Vietnam+)

While the Phong Nha-Ke Bang National Park contains the oldest karst system in Asia, between 400-450 million years old, Hang En owes its relatively young age thanks to its location on the edge of a fault zone (Photo: Oxalis Adventures/Vietnam+)

This cave is considered the second largest cave in Vietnam and third largest in the world, and it also makes up one night of the original five-day Son Doong Cave Expedition being so close to the largest cave in the world (Photo: Oxalis Adventures/Vietnam+)

Entrance to Hang En (Photo: Oxalis Adventures/Vietnam+)

Hang En from an ariel view (Photo: Oxalis Adventures/Vietnam+)