Swimming with Manta Rays in Komodo

Manta Point, Mawan and Manta Alley: where Komodo's reef mantas gather, what draws them there, and the quiet habits that keep each encounter good for them and for you.

It starts as a dark shape under the chop, wider than seems possible. Then a wingtip curls near the surface and the shape becomes a reef manta ray, turning slowly over the rubble below. Komodo National Park holds some of the largest known gatherings of reef mantas, and their sites are regular stops for dive and snorkel boats. Here is where they gather, why they come, how the seasons shift the odds, and how to share the water without disturbing them.

Where the mantas are

Komodo's mantas are reef mantas (Mobula alfredi), a species that can grow up to five meters across and tends to live in shallower, more coastal water than its oceanic relative. A 2022 study led by the Marine Megafauna Foundation identified more than 1,000 individuals in the park from photographs, most of them contributed by dive staff and members of the public. Most photos came from four sites:

• Karang Makassar, better known as Manta Point, in the center of the park near Komodo Island: a gently sloping, shallow rubble field with patches of reef and coral heads where mantas come to be cleaned. Mantas are often clearly visible from the surface, so it is one of the park's well-known manta sites for snorkelers.
• Mawan, an island about five kilometers east of Karang Makassar, with a shallow cleaning station. The station is especially small, and the researchers note that divers often crowded it in peak season.
• Manta Alley, the remote southern site: rocky islands in a large bay lined with steep cliffs, with channels exposed to surge and strong tidal currents.
• Cauldron, in the north: a shallow channel between two islands, strongly affected by tidal currents, where mantas were more often seen cruising through or feeding.

Individual mantas tend to favor particular sites, even ones about five kilometers apart, while some range much farther: eleven have also been photographed at Nusa Penida, more than 450 kilometers to the west.

Why they gather

Cleaning was the behavior the researchers recorded most often at Karang Makassar and Mawan. Small fish pick parasites off the mantas, a service the researchers call vital to their health, and one that also helps wounds heal.

Food comes second. Tidal currents likely carry most nutrients and prey to the central sites, and at Karang Makassar the researchers recorded up to 30 mantas feeding together during the northwest monsoon. Courtship is the third: cleaning stations double as places where mantas court and compete for mates, and courtship was seen throughout the year.

Which months are generally better

Where mantas are seen most shifts with the monsoons. The northwest monsoon runs from about November to April, the southeast monsoon from May to October.

During the northwest monsoon, nutrient-rich water flows in from the Flores Sea and visits rise at the central sites, which tend to see fewer mantas in August and September. In the south the pattern reverses: upwelling, strongest from June to October, enriches the water during the southeast monsoon, and Manta Alley sees more visits.

Strong winds in the wet months, roughly December to March, can limit access to the northern and central sites, and Manta Alley is harder to reach in the middle of the dry season, especially July and August. There is no single right month. A flexible itinerary helps more than the calendar, and no sighting is guaranteed.

How to share the water

The Manta Trust, a manta research and conservation charity, publishes a ten-step code of conduct for swimming with mantas. Research at feeding sites in the Maldives backs it: interactions within three meters caused significantly more avoidance, and chasing or getting in front of mantas disturbed them, sometimes enough to stop them feeding. The core of it:

• Enter the water quietly, no closer than about 10 meters from the manta.
• Keep your fins below the surface. Splashing and noise can scare mantas away.
• Stay at least three meters back. Hold still and let the manta come to you.
• Approach from the side and leave the path ahead of it clear.
• Never chase. You will not catch up with a manta, and you will likely scare it off.
• Never touch a manta. It ruins the encounter, and depending on local laws it can bring a fine.
• Divers: stay at the side of the cleaning station rather than on it, keep low without damaging the reef, and never block a manta swimming overhead.

Conservation groups add two more reasons for care: touch can scrape off the mucus coating that protects a manta from infection, and flash or video lights can agitate it.

If you are filming, let the manta swim into your frame instead of swimming after the shot. Stillness also tends to give calmer footage.

Before you get in

At Manta Point, snorkelers usually enter from the boat and drift with the current along the reef's eastern edge. Moderate currents can run here even when sea conditions are good, so listen to the briefing, stay with your guide, and sit the swim out if conditions turn.

Both reef and oceanic mantas have been protected throughout Indonesian waters since 2014. The park authority has limited boats and people at Karang Makassar since 2019, and in April 2026 it announced a time limit for each boat's divers at a dive site so that groups take turns. Rules like these change, so ask your crew what applies on the day, and expect to wait your turn at busy sites.

Watch how your boat arrives, too. The researchers note that more boat traffic in feeding areas likely raises the risk of boat strikes and propeller injuries, and a crew that slows down near manta sites shows you how it treats the park.