Phong Nha Cave
Cave Extensive limestone cave system with spectacular karst formations
Phong Nha Cave lies within limestone karst of Phong Nha-Ke Bang National Park, reached by riverboat into caverns; guided cave tours and spelunking trips showcase stalactites and underground passages.
Phong Nha Cave is a river cave within the Phong Nha-Ke Bang karst national park in Quang Binh Province, central Vietnam, and forms part of a UNESCO-listed karst landscape. It is notable for an underground river and large inner caverns.
The visitor route is built around a boat trip on the cave’s underground river that reaches a series of caverns with stalactites and stalagmites, and illuminated chambers accessible from the jetty. The site is commonly paired with visits to nearby show caves and park trails that explore the karst landscape.
The cave and surrounding karst were known locally for centuries and were surveyed and mapped by scientific teams in the 20th and 21st centuries; the area became protected as part of a national park and a UNESCO World Heritage listing for its extensive karst systems.
The cave lies near the village of Phong Nha in Quang Binh Province, in central Vietnam’s inland karst region, and is reached by road from the provincial capital and coastal towns.
- Boat access: Visitors travel by small boat along the cave's underground river to view large chambers and speleothems; tours typically cover the navigable section of the cave.
- Context: The cave is part of the larger Phong Nha-Ke Bang karst massif, and other nearby caves and show caves are commonly visited on the same trip.
How to Get to Phong Nha Cave #
Phong Nha village is about 40 km northwest of Dong Hoi; regular buses and private transfers connect Dong Hoi airport and Da Nang. From Phong Nha town the cave entrances are short boat rides along the Son River.
Tips for Visiting Phong Nha Cave #
- Book boat transfers and cave tours in advance during peak season (July-September).
- For Phong Nha Cave, the boat trip on the Son River is integral - choose a tour that includes the river approach for the full experience.
- Wear a light jacket inside certain caves where temperatures can be noticeably cooler.
Best Time to Visit Phong Nha Cave #
February-August is the best window for stable river and cave access; avoid the wettest months when cave tours may be suspended.
Weather & Climate near Phong Nha Cave #
Phong Nha Cave's climate is classified as Tropical Monsoon - Tropical Monsoon climate with hot summers (peaking in June) and mild winters (coldest in January). Temperatures range from 16°C to 32°C. Heavy rainfall (2316 mm/year), wettest in September.
January
January is mild with highs of 22°C and lows of 16°C. Regular rainfall (84 mm) and mostly overcast skies.
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February
February is mild with highs of 23°C and lows of 18°C. Moderate rainfall (57 mm) and mostly overcast skies.
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March
March is mild with highs of 26°C and lows of 20°C. Moderate rainfall (54 mm) and mostly overcast skies.
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April
April is warm with highs of 30°C and lows of 22°C. Moderate rainfall (72 mm) and partly cloudy skies.
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May
May is hot, feeling like 31°C with oppressive humidity. Significant rainfall (137 mm) and mostly overcast skies.
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June
June is the hottest month, feeling like 34°C with oppressive humidity. Significant rainfall (115 mm) and mostly overcast skies.
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July
July is the hottest month, feeling like 34°C with oppressive humidity. Heavy rain (211 mm) and mostly overcast skies.
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August
August is hot, feeling like 33°C with oppressive humidity. Significant rainfall (199 mm) and mostly overcast skies.
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September
September is warm with muggy conditions (dew point 23°C). The wettest month with heavy rain (505 mm) and mostly overcast skies.
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October
October is warm with highs of 28°C and lows of 22°C. Heavy rain (461 mm) and mostly overcast skies.
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November
November is mild with highs of 25°C and lows of 19°C. Heavy rain (293 mm) and mostly overcast skies.
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December
December is mild with highs of 23°C and lows of 17°C. Significant rainfall (128 mm) and mostly overcast skies.
