Mapu a Vaea
Building Coastal blowholes on Tongatapu producing dramatic sprays
Series of blowholes on Tongatapu’s jagged coast where ocean surges force water through lava rock. Visitors watch the water spouts, photograph the bursts and visit nearby beaches.
Mapu a Vaea is a group of coastal blowholes on the western side of Tongatapu in Tonga, commonly known in English as the “blowholes at Houma.” It is one of Tonga’s best-known natural coastal features.
The site is visited for dramatic displays of seawater forced through lava-tube cavities that produce towering sprays and loud, trumpet-like sounds on high surf. Walkways and viewing points along the rocky shore allow visitors to watch the blowholes safely from land.
The blowholes formed where ancient lava flows met the sea and were subsequently eroded to form tunnels and vents; they have long been a locally known natural attraction and feature in Tongan coastal geography.
Mapu a Vaea is located on the coast near the village of Houma on the island of Tongatapu, accessible by road from the island’s main town, Nukuʻalofa.
- Blowholes: A line of coastal blowholes formed in lava rock that can drive columnar sprays of seawater into the air when ocean swell is strong.
How to Get to Mapu a Vaea #
Mapu a Vaea is on the western coast of Tongatapu. It is usually reached by car or taxi from Nukuʻalofa (about 20-30 minutes), and local tour operators include it on half-day island tours.
Tips for Visiting Mapu a Vaea #
- Arrive midday when the blowholes roar and the spray is at its fullest - mornings can be deceptively calm.
- Wear quick-dry clothing; the spray can reach spectators on windy days.
- Stand behind safety rails - strong surges can throw unexpected water high on the viewing platforms.
Best Time to Visit Mapu a Vaea #
Visit during dry-season afternoons for the most reliable blowhole activity, though strong seas in the wet season can produce dramatic displays.
Weather & Climate near Mapu a Vaea #
Mapu a Vaea's climate is classified as Tropical Rainforest - Tropical Rainforest climate with consistently warm temperatures year-round. Temperatures range from 18°C to 29°C. Abundant rainfall (1763 mm/year), wettest in February.
January
January is warm with muggy conditions (dew point 23°C). Significant rainfall (199 mm) and partly cloudy skies.
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February
February is the warmest month with muggy conditions (dew point 24°C). The wettest month with heavy rain (215 mm) and partly cloudy skies.
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March
March is warm with muggy conditions (dew point 23°C). Heavy rain (212 mm) and mostly overcast skies.
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April
April is warm with muggy conditions (dew point 22°C). Significant rainfall (175 mm) and mostly overcast skies.
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May
May is mild with highs of 26°C and lows of 20°C. Significant rainfall (118 mm) and mostly overcast skies.
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June
June is mild with highs of 26°C and lows of 19°C. Regular rainfall (98 mm) and mostly overcast skies.
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July
July is mild with highs of 25°C and lows of 18°C. Regular rainfall (92 mm) and partly cloudy skies.
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August
August is mild with highs of 24°C and lows of 18°C. Significant rainfall (105 mm) and mostly overcast skies.
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September
September is mild with highs of 25°C and lows of 19°C. Significant rainfall (119 mm) and mostly overcast skies.
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October
October is mild with highs of 26°C and lows of 19°C. Significant rainfall (119 mm) and mostly overcast skies.
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November
November is mild with highs of 27°C and lows of 21°C. Significant rainfall (130 mm) and partly cloudy skies.
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December
December is warm with highs of 28°C and lows of 22°C. Significant rainfall (181 mm) and partly cloudy skies.
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