Haliotis Santa Maria
PADI Career Development Centre branch at Hotel Colombo, Vila do Porto, Santa Maria, running boat trips to Ambrósio's mobula rays and the offshore Formigas/Dollabarat reserve, June to October.
Also known as: Dollabarat, Dollabarat Bank, Dollabarat Reef, Dollabarat Seamount, Recife Dollabarat
A remote Atlantic seamount off Santa Maria, the submerged-reef half of the Formigas reserve: big pelagics, current, and a weather-gated, AOW-only crossing.
Last updated October 2026
What breaks the surface after the crossing is a seamount, not an island: a rock plateau whose shallowest point sits around 4-5m, where boats anchor on calm days and divers get their first look at what "flies over" the low before descending. Getting there costs most of a day either way, from Vila do Porto on Santa Maria or, for some operators, from Sao Miguel. From the shallow peak the profile drops quickly toward a 20-30m working depth, the figure every operator and community account describes.
What draws divers out here is scale. One diver who dove Dollabarat in September 2018 described "a mix of mobulas, large stingrays, large groupers, barracudas, amberjack and other small fish," adding, "it is in the middle of the Atlantic, far from the shore, so anything can happen." A separate account from 2018 put it more bluntly: everything at Dollabarat "seemed on steroids size wise."
Banco Dollabarat is the submerged-reef component of the Natural Reserve of Ilheus das Formigas, created by regional decree in 1988 and reclassified in 2003: the reserve "comprises both the emerged area of the islets and an extensive adjacent marine area that includes the submerged reef called Dollabarat." It sits roughly 3nm from the Formigas islets themselves and is consistently sold and dived as a paired product with them, the same boat day. Every Santa Maria operator sourced names Dollabarat as its own distinct product alongside Formigas.
It is not the same site as the area's other well-known offshore product, Baixa do Ambrosio, despite one stale shortlist once listing the two as aliases of each other. Every source that actually describes both treats them as clearly separate: different regulatory instruments, boat-transit times that differ by two to three times in the same first-hand accounts, and a shallower, shorter profile at Ambrosio against Dollabarat's longer, weather-gated crossing. Most divers book them as two separate outings, not one trip with two stops, since each asks something different of the diver and the itinerary.
Plan around the crossing before the dive itself: the trip is regularly called off or rescheduled for sea state even within the main season, and it can turn rough on the way out, with one diver reporting "4m waves in the crossing." "You may not make it out there," as one account puts it plainly, so build slack into your Santa Maria itinerary instead of booking Dollabarat for your last possible day. Once you're in the water, current adds the second layer of difficulty, described by one operator as part of "a 30-mile remote location with strong currents." Bring seasickness medication regardless of how experienced a diver you are.
Operators expect Advanced Open Water for the crossing; a newly certified Open Water diver should not assume a place. One first-hand account describes 50-55 minutes as a personal maximum dive time in 19-20C water wearing a 7mm suit: treat it as one diver's own experience, no more. Inside the reserve, diving needs the park authority's permit, and fishing and taking anything are banned.
What makes this dive site stand out.
Rock plateau's shallowest point sits around 4-5m, well corroborated across every source; divers move freely over it rather than holding a mooring line
Mobula rays are the reliable big-animal sighting; an oceanic manta turns up occasionally but is never guaranteed. Large stingrays, groupers, barracuda and amberjack round out the repeated reports
The submerged-reef half of the same reserve as Ilheus das Formigas, dived as a pair
Moderate to strong current defines the site; the crossing itself can turn rough
A 70-minute to 2.5-hour boat ride, regularly cancelled for sea state
The wider boat-diving season runs May-October, but community trip reports for this crossing cluster June-September.
In at least one reported case, enforcement came down to an in-water skill assessment; operators have used it to admit a diver without a checked AOWD card.
Summary
Powerful open-ocean current, a long crossing in an exposed boat, and a remote location far from shelter.
Safety considerations
What can go wrong here, and what divers do about it. Conditions change - take the briefing from the operator on the day.
Book a guided dive at this site.
PADI Career Development Centre branch at Hotel Colombo, Vila do Porto, Santa Maria, running boat trips to Ambrósio's mobula rays and the offshore Formigas/Dollabarat reserve, June to October.

SSI dive centre and PADI Resort at Vila do Porto marina, Santa Maria, Azores, running boat day trips to Baixa do Ambrósio's mantas since 2009.

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No. The two are consistently treated as separate dives across every source that names both: the official tourism board gives Ambrosio and Dollabarat each their own dedicated dive-spot page, and separately pairs Dollabarat with Formigas rather than Ambrosio on its general island overview; they sit under different legal instruments, boat-transit times differ by roughly two-to-three times in the same first-hand accounts, and community threads treat them as separate certification and planning decisions. A single country-level shortlist once listed Ambrosio as an alias of Dollabarat; every source that actually describes both sites contradicts it.
Every Santa Maria operator sourced runs the trip from Vila do Porto, and this is where most divers depart from. Community and operator accounts put the crossing at roughly two to two-and-a-half hours each way, while the Azores tourism board's own dedicated page for the site states 70 minutes from the same port. A minority of accounts describe the trip running from Sao Miguel instead, a separate two-to-two-and-a-half-hour crossing from Vila Franca do Campo or Ponta Delgada. Neither the Santa Maria transit time nor the departure island is settled; confirm both when booking.
Operators and divers consistently describe a shallow peak around 4-5m dropping to a 20-30m working depth, and no first-hand account describes actually diving deeper than that. The Azores tourism board's own page for the site separately states an average depth of 20m and a maximum of 50m. Both figures are on record; treat 20-30m as the working dive and the deeper figure as unconfirmed by any diver account.
Every source that states a requirement treats this as an advanced-diver site. Treat AOWD as the expectation and confirm with the operator beforehand if you hold Open Water only; at least one operator has admitted a diver without it after a few check dives judged their in-water skills.
Divers repeatedly report mobula rays as the reliable big-animal sighting, large stingrays, dusky and island grouper, barracuda and amberjack, described by more than one first-hand account as unusually large for the region; an oceanic manta shows up too, but only as an occasional, unguaranteed extra. One diver who researched the trip in advance found that video footage of the site tends to under-represent what divers actually encounter in the water.
The wider Azores boat season runs May to October, with community trip reports for this crossing clustered June to September. It is not diveable year-round even within season: the open-ocean crossing is regularly cancelled for weather, and divers staying multiple days on Santa Maria still sometimes fail to make it out. Book with margin.
Yes. It sits inside the Natural Reserve of Ilheus das Formigas, created in 1988 and reclassified in 2003, covering both the islets and an extensive area of surrounding open Atlantic that includes the submerged reef; fishing is prohibited reserve-wide. Diving here needs the park authority's permit and taking or damaging anything is banned, so confirm with your operator that the permit is in place when you book.
Santa Maria's dive operators sell Dollabarat as a named product from Vila do Porto, usually paired with Formigas on the same boat day, and access is shared among them. Pricing is thin and varies by operator, departure port and account: figures on file for this paired trip run from around EUR 199 (Santa Maria departure) to EUR 230 (a diver's own account of a Sao Miguel departure), and other accounts of the same trip put the top end higher still. Confirm the current rate when booking.
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