Indian Ocean · Maldives
Ari & Rasdhoo Atolls
Whale sharks live year-round on the South Ari reef shelf
Photo: John Hepburn · CC BY 4.0
Ari Atoll, with little Rasdhoo off its north-east coast, is chosen for regular encounters with big marine life and is a fixture on liveaboard routes. Current-swept thilas such as Fish Head and Maaya Thila carry grey reef sharks and dense fish life, Maamigili Beyru on the southern edge is a long drift where whale sharks are present all year, Hammerhead Point at Rasdhoo means scalloped hammerheads in blue water, and manta cleaning stations sit around the atoll.
About diving in Ari & Rasdhoo Atolls
Ari features on the routes of many Maldivian liveaboards, which work its thilas, giris and kandus, and boats crossing between Ari and South Male often stop at Rasdhoo for Hammerhead Point. Dive centres on the inhabited islands of Rasdhoo and Dhigurah run day trips; on Dhigurah fun dives are daily, often a two-tank morning trip and an afternoon dive. Current shapes each dive: guides may run a descent and ascent line on the thilas, and a blue-water safety stop can bring a group up some way from the boat.
Ari has few long stretches of barrier reef; instead thilas, submerged pinnacles inside and outside the lagoons, gather the life, some topped with table coral at 5 m, with kandus (channels) cutting between them. Strong currents leave the coral less lush than elsewhere in Asia, but the fish make up for it: packs of grey reef sharks and spotted eagle rays on the pinnacles, bigeye trevally hunting over the reefs at night, Napoleon wrasse and turtles on the slopes, nudibranchs and frogfish in the shallows. South Ari's long reef shelf is a whale shark aggregation area, and the horseshoe reef of Rasdhoo Madivaru has a wall below 20 m with overhangs, caverns and crevices.
Ari suits divers who come for regular encounters with big marine life and are at ease in moving water. The hammerhead dive starts at dawn with a descent past 30 m to hang in open blue, and the current on Maaya Thila is very changeable, so the crew's experience and judgement count. A diver who wants gentle coral gardens with no current will find Ari's best sites the opposite of that, while one who wants sharks, mantas and whale sharks on the same trip will find all three present year-round.
Best time to dive Ari & Rasdhoo Atolls
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | Prime | Prime | Prime | Prime | Prime | Good | Good | Good | Good | Good | Good | Prime |
| Sea surface | 28°C82°F | 29°C84°F | 29°C84°F | 30°C86°F | 30°C86°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F |
| Daytime high | 28°C82°F | 29°C84°F | 29°C84°F | 30°C86°F | 30°C86°F | 30°C86°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F |
| Rain | 63 mm2.5 in | 32 mm1.3 in | 49 mm1.9 in | 77 mm3.0 in | 207 mm8.1 in | 115 mm4.5 in | 157 mm6.2 in | 174 mm6.9 in | 179 mm7.0 in | 202 mm8.0 in | 224 mm8.8 in | 166 mm6.5 in |
| Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|
| Prime | Prime | Prime | Prime | Prime | Good |
| Sea surface | |||||
| 28°C82°F | 29°C84°F | 29°C84°F | 30°C86°F | 30°C86°F | 29°C84°F |
| Daytime high | |||||
| 28°C82°F | 29°C84°F | 29°C84°F | 30°C86°F | 30°C86°F | 30°C86°F |
| Rain | |||||
| 63 mm2.5 in | 32 mm1.3 in | 49 mm1.9 in | 77 mm3.0 in | 207 mm8.1 in | 115 mm4.5 in |
| Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|
| Good | Good | Good | Good | Good | Prime |
| Sea surface | |||||
| 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F |
| Daytime high | |||||
| 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F |
| Rain | |||||
| 157 mm6.2 in | 174 mm6.9 in | 179 mm7.0 in | 202 mm8.0 in | 224 mm8.8 in | 166 mm6.5 in |
2011–2025 averages. Sea surface: NOAA Coral Reef Watch, measured at the surface, so deeper water can run colder. Daytime high and rain: NASA POWER.
Diving runs all year. December opens the calm stretch, and liveaboard departures are firmest from December to May, when the seas settle most; outside those months the seas are unpredictable. The northern-rim manta station is busiest from December to March. Mantas stay common through the rest of the year and reach their peak from August to November. Whale sharks and hammerheads do not follow the calendar.
Best months: January, February, March, April, May, December
Ari & Rasdhoo Atolls water temperature and weather by month
The sea surface stays between 28 and 30 °C (82–86 °F) all year. Most rain falls from July to December, peaking at about 220 mm (8.7 in) in November; it stays largely dry from January to April. Daytime highs sit around 29 °C (84 °F) all year. The coldest water here is about 26 °C (79 °F), so pack a 3 mm full suit.
Dive types & marine life
Whale sharks are resident year-round in the South Ari Marine Protected Area, and scalloped hammerheads are resident at Hammerhead Point in every month, best found at first light. Mantas are common all year, peaking from August to November, with February and March the best months at Panettone Thila. Grey reef sharks, eagle rays and Napoleon wrasse are regulars on the thilas.
- Drift
- Reef
- Pelagic & blue water
- Night
- Wreck
- Wall
- Whale sharks
- Manta rays
- Hammerheads
- Reef sharks
- Eagle rays
- Napoleon wrasse
- Sea turtles
- Trevally & jacks
- Nudibranchs
Best dive sites in Ari & Rasdhoo Atolls
- 1
Fish Head (Mushimasmingili Thila)
Pinnacle where grey reef sharks lead the show and spotted eagle rays pass often
- 2
Maaya Thila
Thila crowded with life, from nudibranchs and frogfish to turtles; a night dive in slack water
- 3
Hammerhead Point (Madivaru Corner)
Early-morning blue-water dive off Rasdhoo's outer wall for resident scalloped hammerheads
- 4
Maamigili Beyru
South Ari's outer reef, sloping to 10 m then walling past 40 m; the best-known whale shark spot
- 5
Halaveli Wreck
Upright cargo wreck off Halaveli, deck at 21 m and sand at 28 m, home to large morays and a turtle
- 6
Panettone Thila
East-coast manta point, one of Ari's most reliable for mantas
Site guides
Pinnacle
Ocean-facing pinnacle at the mouth of Bathala channel
Mantas at a cleaning station from December till April
Reef
A canyon cut diagonally through the middle of a channel reef
Pinnacle
South-side overhangs with gorgonian fans and black corals
Glassfish packed into the wheelhouse of a sunken trawler
Pinnacle
An estimated sixteen resident grey reef sharks
Pinnacle
A pinnacle eroded into five separate pieces, 12 m to 40 m
Grey reef sharks hunting in the blue around a tiny volcano-shaped top
Wreck
Upright cargo wreck, deck at 21 m and sand at 28 m
Pinnacle
Blue sponges and black-coral overhangs on a small pinnacle
Pinnacle
Shallow top reef from 5 m, with anthias over the safety stop
A small arch and two sea-fan overhangs on a channel-swept thila
Cave & cavern
Two swim-through caverns, at 18-20 m and 28-30 m
Wreck
40 m supply boat at 20 m, sheltered enough for night dives
Wall
The best-known whale shark spot on South Ari's outer reef
Dived day and night, with sharks working the coral
Channel & pass
More than 100 grey reef sharks can patrol the channel mouth
Wall
Wall from 4 m to past 40 m, straight off Kuramathi
Mantas swooping past a reef cut with shelter channels
Pinnacle
A field of table coral crowning a thila of caverns and overhangs
Channel & pass
Advanced channel drift with sharks between 22 and 30 m
An early-morning drop into the blue for hammerheads
One of the few places whale sharks stay all year
Pinnacle
Manta cleaning station on a pinnacle facing the open ocean
How to get to Ari & Rasdhoo Atolls
Flights land at Velana International Airport in Malé. Scheduled speedboats run daily to Rasdhoo in about 1 hour and 15 minutes, and speedboats reach Dhigurah in South Ari in around 1.5 to 2 hours from Malé or the Villingili Ferry Terminal.
Photos from Ari & Rasdhoo Atolls
John Hepburn · CC BY 4.0
John Hepburn · CC BY 4.0
Dive videos
Diving the Maldives: Central Atolls [4k] · Chris Underwater on YouTube
Diving in the Maldives - Central Atolls Route - Liveaboard week 20230225 · BLUE FORCE FLEET on YouTube
Questions divers ask
Where are the manta cleaning stations in Ari Atoll?+
Donkalo Thila in west Ari, Rangali Madivaru in the south-west and Kudarah Thila in the south-east are cleaning stations, and Ukulhas Thila on the northern rim has one on a pinnacle facing the open ocean.
Is South Ari Atoll a marine protected area?+
Yes. The Maldives government declared the South Ari Atoll Marine Protected Area in 2009; it runs along the reef from Rangali in the west to Dhigurah in the north and is one kilometre wide.
Can Ari Atoll be dived without a liveaboard?+
Yes, from dive centres on Rasdhoo and on Dhigurah in South Ari. Ari is over 40 km long and its best sites lie far apart, though, so a liveaboard is the only practical way to dive more than a few of them.
What experience does diving Ari Atoll need?+
Intermediate to advanced. Current can be strong across the thilas and channels, and good buoyancy control keeps fins clear of delicate growth while the water moves. In little or no current Maaya Thila can suit all levels.
Sources
- Ari Atoll diving — Dive The World
- Rasdhoo diving — Dive The World
- Ocean Dive — aMaldives
- Dive Bro’s Dhigurah — aMaldives
- South Ari Atoll MPA — Wikipedia
- Mahibadhoo sea temperature — seatemperature.org
Photo credits
- A redtooth triggerfish hovers over cauliflower coral on a central Maldives reef by John Hepburn, CC BY 4.0, via Wikimedia Commons
- A redtooth triggerfish swims above the reef in the central Maldives atolls by John Hepburn, CC BY 4.0, via Wikimedia Commons
- An Acropora robusta coral colony growing on a shallow Maldives reef flat by John Hepburn, CC BY 4.0, via Wikimedia Commons
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In The Logbook
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