I’d hoped to sign up for this unique adventure on my upcoming trip to Vietnam.

BUT the only company running the trip shuts down from mid-September until end of November.

Én is the third largest cave in the world, after Hang Sơn Đoòng in the same national park, and Deer Cave in Malaysia.

The cave has its own jungle, waters, beach, and climate.

Details

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Trip report by Indie Traveller:

First explored in 1994, Hang En is now known to be the world’s third-biggest cave. …

First, you have to hike for a half day through the stunning Phong Nha Ke Bang national park. Then, you get to camp in tents set up inside the cave.

When you wake up, you’ll see the first sunlight beaming through the cave entrance.

Making it feel even more special is that the tours to Hang En are kept wonderfully small-scale; only one company is licensed to run expeditions there and they will only take one group of up to 12 people at a time. …

Camping Inside Hang En, The World’s 3rd Biggest Cave

This 2-day ecotourism adventure is easily one of the most epic things I’ve done in Asia