Trung Trang Cave is one of the most remarkable natural attractions within the Cát Bà National Park on Cát Bà Island. This large, cross-mountain cave offers visitors a unique 300-meter journey through millions of years of geological formation, juxtaposed with a fascinating wartime history.
Introduction to the Natural Marvel
Geological Beauty: The cave runs through a limestone mountain, showcasing a complex and diverse ecosystem of magnificent stalactites and stalagmites. These formations, shaped over millions of years, take on countless unique and often fantastical shapes, giving the interior an ethereal, “fairyland” atmosphere.
The Path: The cave is well-lit and features a wooden walkway, making it easy to traverse. The journey is linear, with an entrance and an exit that is a short walk from the entrance area. The minimal lighting enhances the mystery while ensuring safety.
Ecosystem: The cave is a haven for several species adapted to the dark, including the Hạ Long Leaf-nosed Bat and various insects and reptiles, highlighting its importance as a local ecological site.

History, Culture, and Legends
Ancient History: Archaeological evidence suggests that the cave was a dwelling place for ancient Vietnamese people as far back as 6,000 years ago.
Wartime Use (Navy Cave): During the American War (Vietnam War), Trung Trang Cave was not used as a hospital, but rather served as a crucial radio and telecommunication station for the Vietnamese Navy. This strategic wartime use earned it the nickname ‘Navy Cave’. Visitors can still see remnants of the infrastructure, such as meeting rooms and water tanks.
The Legend of Lady Trung Trang: Local folklore links the cave’s name to a heroic female figure, Lady Chua Trung Trang. It is said she summoned the local youth to fight off invaders, and after the victory, she returned to the cave to cultivate spirituality and protect the islanders, leading the local people to name the cave in her honour.
Practical Visitor Information
Feature | Details |
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Location | In Trung Trang Valley, within the Cát Bà National Park area, approx. 15 km northwest of Cát Bà Town. |
How to Get There | Located directly on the main cross-island road towards Gia Luận Port. Easily accessible by motorbike/scooter rental or taxi from Caˊt Baˋ Town (approx. 20 minutes). |
Opening Hours | Daily: 8:00 AM−5:00 PM (Hours may vary seasonally). |
Entrance Fee | Adults: ∼80,000 VND−120,000 VND (The ticket is often a combined entry ticket for both Trung Trang Cave and access to the Caˊt Baˋ National Park trekking trails like Ngu Lam Peak). |
Contact Information | As part of the Caˊt Baˋ National Park, contact information is generally managed by the park authority or local tour operators. |

Tips for a Rewarding Visit
Footwear: Wear comfortable, non-slip shoes, as the cave can be damp and surfaces can be uneven.
Temperature: The cave maintains a cooler, more humid temperature than the outside air, offering a pleasant respite on hot days.
Combined Itinerary: Since the entrance fee includes the National Park, many visitors combine the cave exploration with the nearby 1 km Kim Giao Forest hike or the ascent to Ngu Lam Peak for panoramic island views.
Parking: Paid parking for motorbikes and cars is available near the entrance.