On the southern coast of Sri Lanka, near the small fishing village of Kudawella, a crack in the shoreline does something remarkable: it shoots a column of seawater up to 25–30 metres into the air. Hummanaya Blowhole is the only known blowhole in Sri Lanka and is widely regarded as the second largest blowhole in the world. The name itself comes from the deep, resonant humming sound the formation produces when it is active — a sound you can hear before you can see the spray.
What is a blowhole and how does Hummanaya work?
A blowhole forms when coastal erosion carves an underwater cavern into a sea cliff, and the cavern develops an opening at the surface above. As waves push water into the cavern below, compressed air and seawater have nowhere to go but up — erupting through the surface vent in a periodic fountain. At Hummanaya, several geological processes worked together over centuries to create this formation:
- Hydraulic action: wave pressure forces air into existing cracks, gradually widening them.
- Abrasion (corrasion): waves carry rocks, pebbles, and sand that physically grind away the rock face.
- Chemical weathering: the mild acidity of seawater slowly dissolves certain rock minerals.
- Attrition: loose rock fragments tumbling in the surf act like sandpaper, smoothing and eroding the cavern walls.
The height and timing of each eruption depend on the state of the tide and the size of the incoming swells. On days with strong surf — particularly during the southwest monsoon — the eruptions can be especially dramatic.
Where exactly is Hummanaya Blowhole?
Hummanaya sits near Kudawella, a coastal village roughly 5 km east of Dickwella and about 25 km east of Matara in the Southern Province. To reach the blowhole itself, visitors cross a tombolo — a narrow tongue of deposited sand or gravel that connects what was once an offshore rock formation to the mainland. This short walk across the tombolo is part of the experience and gives a clear sense of how the sea shapes the land around it.
Matara is well connected to Colombo by the Southern Expressway, making the journey straightforward. From Galle, the drive along the coastal road through Unawatuna and Weligama takes roughly an hour under normal traffic conditions. If you are planning a broader southern circuit, a Galle city tour pairs well with an afternoon stop at Hummanaya.
When is the best time to visit Hummanaya?
The blowhole is active year-round, but eruption height and frequency vary with the sea conditions. The southwest monsoon (roughly May to September) brings larger swells from the Indian Ocean, which can intensify the eruptions considerably. However, this period also brings unpredictable weather along the south coast. The shoulder months — April and October — often offer a balance of active surf and reasonable weather.
The dry season for the south coast (November through March) is prime beach-holiday time, and the sea is generally calmer. Eruptions still occur but may be less spectacular on flat, windless days. Early morning visits, before tour groups arrive, allow for a quieter experience and better light for photography.
What can you see and do near Hummanaya?
The immediate setting around Kudawella is worth exploring on its own terms. Fishing boats work from the nearby cove, and the rocky shoreline offers tide-pool exploring. The coastal road between Dikwella and Tangalle passes through some of the least developed stretches of Sri Lanka's south coast.
Combining a blowhole visit with other southern highlights is straightforward. The Sinharaja Forest Reserve, Sri Lanka's UNESCO-listed rainforest, lies roughly 50 km to the north and makes a rewarding day trip for wildlife and birdwatching. Coastal conservation projects, such as sea turtle programmes near Kosgoda and Hikkaduwa, are also within a two-hour drive along the coastal highway. Further inland, Udawalawe National Park offers reliable elephant sightings and is accessible from the southern coast in under two hours.
Is Hummanaya safe to visit?
The area around the blowhole is open and unfenced in places, and the rocky ground can be slippery when wet from spray. Visitors should stay well back from the vent opening and avoid standing directly over it or in the trajectory of the jet. Children should be supervised closely. It is wise to keep cameras and phones away from the spray zone until you have gauged the reach of that day's eruptions. Local guides on site can advise on safe viewing positions.
How do I get to Hummanaya Blowhole from Colombo?
The most practical route is to take the Southern Expressway (E01) to the Matara exit, then follow the coastal road east toward Dikwella and Kudawella — a total journey of around 175–180 km. By private car or taxi, the drive typically takes three to three-and-a-half hours from Colombo depending on traffic. Public buses run frequently between Matara and Tangalle and stop at Dikwella, from where three-wheelers (tuk-tuks) cover the short distance to the blowhole site.
What else should I know before visiting?
There is a small admission fee collected at the site; this is a local charge that may vary and is best confirmed on arrival. Basic refreshments and light snacks are available from vendors nearby. There are no large resort facilities at the site itself, so plan your visit as part of a day itinerary rather than a standalone destination. The nearest range of accommodation is centred around Dikwella, Matara, and Tangalle, all of which have options across most budget levels.
