For a first cave visit in Hai Phong, choose Trung Trang Cave for limestone formations or Hospital Cave for wartime history. Both are on Cat Ba’s cross-island road and are more straightforward to plan than Hoa Cuong, Thien Long or the dispersed caves at Elephant Mountain.
This guide covers six land-based cave experiences within Hai Phong: four on Cat Ba Island, the Elephant Mountain cave-and-hiking complex, and Hang Pagoda in Do Son. It excludes sea-level passages visited on Lan Ha Bay cruises and caves across the provincial boundary in Ha Long. Arrange access before leaving for Hoa Cuong, Thien Long or an individual Elephant Mountain cave, and check whether recent rain has affected the approach.
Choose a Hai Phong cave by trip style
- First natural cave visit: Trung Trang Cave, if you are comfortable with narrow and low passages.
- Wartime history: Hospital Cave, where a reinforced medical complex was built inside a natural cave.
- Northern Cat Ba detour: Hoa Cuong Cave near Gia Luan, after confirming the day’s access.
- Mangrove-and-cave outing: Thien Long Cave in Phu Long, with a pre-arranged local boat and guide.
- Mainland hiking: Elephant Mountain, where caves form part of a wider heritage and countryside route.
- Religious and cultural visit: Hang Pagoda in Do Son, a short natural cave used as an active Buddhist site.
Caves on Cat Ba Island
1. Trung Trang Cave
Trung Trang is one of Cat Ba’s more established visitor caves. The passage runs for about 300 meters through a limestone mountain, alternating between larger spaces and narrow, enclosed sections. Expect uneven walking, low ceilings and places where you may need to stoop.
The cave is known for its natural formations and ecosystem, but it also has a wartime layer. A naval communications unit used the cave from 1964 to 1968, and traces of that period remain along the route. Admission may be sold as part of a Cat Ba National Park visitor route, so check which park areas your ticket covers before entering.
Best for: a first natural cave visit if confined passages are not a problem. Ask about the current route before entering if you have reduced mobility or claustrophobia.
2. Hospital Cave (Quan Y Cave)
Hospital Cave is a historical complex built inside Hung Son Cave. From 1963 to 1965, reinforced concrete rooms were constructed within the limestone mountain to create a protected field hospital and shelter. The site extends for about 200 meters and has three levels with 17 rooms used for medical care, work, meetings, training and other wartime functions.
Visit for the relationship between the natural cave and the structure built inside it, not for stalactites alone. A guide can make the room layout and wartime purpose easier to understand. Confirm the day’s opening arrangement, admission and accessible sections before making it a fixed stop.
Best for: travelers interested in military history, engineering and how people adapted a natural cave.
3. Hoa Cuong Cave, Gia Luan
Hoa Cuong, also called Đá Hoa Cave, lies near Gia Luận on northern Cat Ba. The cave is nearly 100 meters long, with a large arched entrance, stalactites and a small clear pool over pale pebbles. Reaching the entrance involves stairs, so this is not a simple roadside photo stop.
Hoa Cuong suits a northern-island route, but its opening and staffing arrangements can vary. Confirm access before traveling to Gia Luan, and ask whether recent rain has affected the steps or floor.
Best for: travelers already exploring the Gia Luan side of Cat Ba who want a compact natural cave.
4. Thien Long Cave, Phu Long
Thien Long is not a cave to add casually to a road trip. The local visitor route starts in the Phù Long area and can involve a small boat through a mangrove channel followed by a walk to the entrance. The cave has a narrow approach and three main interior sections with natural formations.
The destination may also appear as Phù Long Cave or Khẩu Quy on local bookings and directions, so confirm the exact cave when arranging transport. A driver alone does not solve the final approach: organize the boat, guide, entrance access and return timing before leaving your accommodation.
Best for: active travelers who want a guided mangrove-and-cave outing and are comfortable with a small boat, uneven walking and a less developed setup.
For the complete boat-and-walk arrangement, see the Phu Long mangroves and Thien Long Cave visit guide.
How to plan a Cat Ba cave day
Trung Trang and Hospital Cave make the most practical pair because both lie along the cross-island road. Allow a half day only after confirming that both are open. Add the national park landscape around Trung Trang rather than trying to include every cave on the island.
Keep Hoa Cuong for a northern Cat Ba route and treat Thien Long as a separate pre-arranged excursion. Trying to combine all four in one day leaves too little margin for local access, boat arrangements and changing path conditions. An overnight stay gives you more margin for the crossing and an unhurried cave visit.
If you start in Hai Phong city, the Hai Phong to Cat Ba transfer uses one vehicle to Dong Bai Ferry Terminal, a foot-passenger crossing, and a second vehicle from Cai Vieng to your Cat Ba drop-off. It is a point-to-point transfer, so arrange the island vehicle and cave stops separately unless they are confirmed in your booking.
If you prefer an overnight cruise with a land-cave visit already in the itinerary, the Mila Grand Cruise 2 day 1 night lists Trung Trang Cave on day two, while the Calypso Cruise 2 day 1 night lists Quan Y Cave. Check the live itinerary and reconfirm the cave stop before booking because operating routes can change.
Overnight Cruise
Lan Ha Bay Mila Grand Cruise 2 day 1 night tour
Overnight Cruise
Lan Ha Bay Calypso Cruise 2 day 1 night tour
Mainland cave and cave-pagoda visits
5. Elephant Mountain caves
Elephant Mountain is a dispersed heritage-and-hiking complex across the present-day An Lão and An Trường communes. Cave names you may encounter include Họng Voi, Già Vị, Chiêng and Bể, but these openings are spread across the mountain and are not one managed show-cave route.
Choose Elephant Mountain for the countryside walk, limestone terrain and cultural sites, with a cave as one possible part of the outing. Confirm the intended entrance and return path locally, and do not assume that every named cave is unlocked, staffed or suitable to enter that day.
The Hai Phong Hiking Tour includes Long Hoa Pagoda, Già Vị Cave, Elephant’s Back and Fairy Chessboard. Ask about the day’s cave access, exact starting side and any route change after rain before booking.
Best for: active travelers who want a mainland countryside hike with local route support.
6. Hang Pagoda, Do Son
Hang Pagoda, also called Cốc Tự, is an active Buddhist site built in and around a natural coastal cave in Do Son. The cave runs for about 25 meters and narrows toward the rear, so this is a short cultural and religious visit rather than an underground adventure.
Local tradition associates the site with the early arrival of Buddhism by sea. Visit respectfully: cover shoulders and knees, keep your voice low, follow signs or instructions, and ask before photographing worshippers or a ceremony. Lunar observance days and festival periods can be much busier than an ordinary weekday.
Best for: travelers interested in Buddhist culture and Do Son history rather than cave depth or difficult terrain.
Cave safety and access checklist
- Confirm the entrance, operating arrangement, fee and return route on the day of your visit; a map pin does not prove public access.
- Wear closed shoes with reliable grip. Postpone an undeveloped cave or limestone hike after heavy rain or when thunderstorms are likely.
- Carry a proper flashlight or headlamp even where lighting is expected, and do not rely on a phone as your only light.
- Do not enter an unstaffed opening alone or go beyond the section approved by a guide, caretaker or site representative.
- Do not touch or strike formations, disturb wildlife, leave markings or remove stone.
- Do not drink untreated water from a cave, spring or well.
- For the Thien Long boat approach, use the arranged local operator, wear the provided life jacket and follow the boat crew’s instructions.
- Tell the guide in advance about mobility limits, breathing conditions or claustrophobia, and turn back if the route no longer feels safe.
Do not treat restricted caves as secret attractions
Quả Vàng and other remote openings may appear in online cave lists or map results. Their existence does not establish public access. Do not enter conservation zones, military areas or private land without explicit permission and an approved local guide. If those conditions cannot be confirmed, choose an established visitor site or managed route instead.