Beyond Whale Sharks: Mantas, Turtles and the Reefs of South Ari Atoll

Most visitors come to Maamigili for the whale sharks. They leave talking about the manta ray that glided past them and the green turtle that let them swim alongside it. South Ari Atoll has one of the richest marine ecosystems in the Maldives, and whale sharks are only the most famous resident. Across 791 guest reviews of Koimala alone, manta rays are mentioned 54 times and turtles 33 times. These encounters are routine here, not rare. Here is what else lives in these waters.

If you are planning a trip and want guidelines for responsible encounters with every species you might meet, our post on responsible swimming in South Ari Atoll covers the approach code for all marine life.

The Whale Shark Gets All the Attention. The Rest of the Ocean Is Waiting.

A whale shark excursion from Maamigili targets the biggest fish in the sea. But the boat crew spots everything else along the way. A manta ray breaks the surface while you are scanning for the shark’s dorsal fin. A green turtle surfaces for air two metres from your mask. A reef shark passes below the boat on its way along the coral wall.

Most guests leave having seen four or five species in a single morning. The whale shark is the reason they came. The rest of the marine life is the reason they return.

Manta Rays: The Gentle Acrobats

Reef manta rays (Mobula alfredi) are common throughout South Ari Atoll. Their wingspan reaches up to 5 metres. Like whale sharks, they are filter feeders. They are smaller, more agile, and they put on a different show.

Manta rays visit cleaning stations on the reef. Small fish gather on the manta’s skin and remove parasites. The manta holds still, wings spread wide, while the cleaning crew works. It is one of the most intimate encounters you can have in the ocean. The manta’s belly is white and smooth. The smaller fish dart across its surface in quick, precise movements. You float above the scene, watching a relationship that has played out on reefs for millions of years.

When mantas are feeding, they barrel-roll through plankton clouds. Their mouths open wide. They loop and dip with a precision that looks choreographed. The wing beats are slow and deliberate. Each pass brings them closer to the surface. You can hear the water displace as a wing pushes past.

“Swimming with a manta and a whale shark is a must see.” (Czika11, TripAdvisor, April 2022)

That guest returned for a second stay at Koimala. The manta encounter was part of the draw.

Manta ray encounters are common on Koimala excursions. Across 791 reviews, guests mention mantas 54 times. The crew knows the cleaning stations and the feeding zones. For responsible approach guidelines when you encounter a manta, see our responsible swimming guidelines for all marine encounters.

Green Turtles: The Reef Residents

Green turtles (Chelonia mydas) live on Maamigili’s reefs year-round. They rest on the coral, graze on seagrass beds, and surface for air with a distinctive head pop. You see the top of their head break the surface, then they slip back under.

A typical turtle encounter starts on the reef. You are snorkeling along the coral. A green turtle glides past at arm’s length. Its pace is unhurried. It tucks its head down and keeps feeding. You float above it, watching the front flippers move in slow, sweeping strokes. The shell is mottled green and brown. Small fish hitch a ride in the current behind it.

Guest reviews mention turtles 33 times across 791 stays. Turtles are a protected species in the Maldives. The crew enforces a respectful distance. You watch. The turtle decides how close to let you get.

Green turtles are one of the most commonly sighted species on Maamigili’s house reef. You do not need a boat excursion to see one. The bikini beach snorkeling area has regular turtle sightings, especially in the early morning when the water is calmest.

Reef Sharks, Eagle Rays and the Rest of the Cast

South Ari Atoll’s reef system supports a wide range of marine species beyond the flagship animals.

White-tip and black-tip reef sharks are common on dives and snorkels. They cruise along the reef edge and rest in the shallow channels. They are slender and fast, and entirely uninterested in humans. A black-tip reef shark cutting through the blue water is one of the cleanest lines you will see in the ocean.

Eagle rays appear occasionally. When they do, they travel in small groups. Their wingspan and the pattern of white spots across their dark backs make them unmistakable. They pass through the atoll’s channels with the current, wings flexing in a slow undulation.

Moray eels are resident on most reefs. You see their heads poking from crevices. Some species reach over a metre in length. They open and close their mouths regularly to push water across their gills. It looks like a grin. It is just breathing.

Napoleon wrasse are large, curious fish. They grow up to 2 metres. They follow divers and snorkelers with apparent interest. The crew knows the regular individuals by the markings on their heads.

Reef pelagics including barracuda, trevally, and fusiliers move through the water column above the reef. Barracuda patrol in small schools. Trevally hunt in coordinated groups. Fusiliers flash silver in the current.

What a Single Excursion Can Show You

A whale shark excursion from Maamigili is a multi-species experience. The boat heads to the open water where whale sharks feed. Along the way, the crew scans for mantas, turtles, and dolphins. When the whale shark encounter is done, the boat often drifts to a reef section for additional snorkeling.

“We saw whale sharks, turtles and Manta rays (go pro footage was sent to us for free after!)” (Emily, United Kingdom, Booking, November 2024)

The crew’s eye for the water makes the difference. They spot the manta fin break from 50 metres. They notice the turtle surfacing while you are focused on the shark. They position the boat so that the drift carries you past the cleaning station on your way back.

“From Rifath, Prem, Kanchan and special mention to Ripon who has been in every highlight of our stay keeping us safe while swimming with the whale sharks and the manta rays.” (Beth, United Arab Emirates, Booking, October 2023)

For a full list of excursions with manta, turtle, and reef trips, see our excursion page.

Snorkeling vs Diving: Which Shows You More?

Both snorkeling and diving are available from Maamigili. They give you different views of the same ecosystem.

Snorkeling keeps you at the surface. Whale sharks, manta rays, and turtles all come to the upper water column. Snorkeling is where you see the big animals in open water. The visibility range is 10 to 30 metres depending on the season. You cover more horizontal distance on a snorkel excursion.

Diving takes you deeper into the reef structure. Reef sharks, eagle rays, moray eels, and Napoleon wrasse are more common at depth. Diving lets you sit on the reef and watch the micro-ecosystem up close: cleaner shrimp picking parasites off a shark’s skin, anemone fish darting in and out of their host. Occasional hammerhead sightings happen on deeper dives at the atoll’s channel edges.

Across 791 reviews, diving is mentioned 121 times. Many guests combine both activities during their stay. The whale shark excursion is a snorkeling activity. The house reef and dive sites fill in the rest.

The House Reef: What You Can See from the Beach

Maamigili’s house reef and the bikini beach snorkeling area offer a low-effort alternative to the boat excursions. Walk into the water from the beach and you are on the reef.

The house reef holds reef fish in large numbers. Parrotfish, angelfish, butterflyfish, and triggerfish occupy the shallow sections. Green turtles pass through regularly. Occasional reef shark sightings happen in the deeper channels.

The house reef is a good option for mornings before the excursion boat leaves. It is also a good option for rest days between excursions. South Ari Atoll puts the marine life within walking distance of the beach.