Cabilao Island lies off Bohol’s northwest coast, separated from the mainland municipality of Loon by a channel roughly 8 kilometres wide that funnels current and, for part of the year, sharks. The island covers about 8 square kilometres, administratively organized into several barangays under Loon, with a population of 8,000–10,000 depending mainly on fishing and small-scale agriculture. Dive tourism is a secondary income stream centred on two to three small resorts along the eastern shore, employing local boatmen, dive guides, and kitchen and housekeeping staff alongside the fishing and farming that still support most households.
The specific draw is the scalloped hammerhead shark (Sphyrna lewini), which aggregates in the channel waters between January and April — sightings aren’t guaranteed, but Cabilao has built a decades-long track record as one of a small number of Philippine sites where seasonal hammerhead encounters remain plausible. The behaviour behind the aggregation is a genuine piece of shark biology rather than a marketing hook: scalloped hammerheads are known worldwide for forming large daytime schools around seamounts and channel walls where currents are strong and cooler water wells up from depth, a pattern researchers link to social structuring within the school and to cleaner-fish stations along the reef rather than to feeding, which mostly happens after dark and away from the aggregation site. The species carries a Critically Endangered assessment on the IUCN Red List, driven mainly by demand for shark fins across Asia, which gives a Cabilao sighting a conservation weight beyond the dive-log entry — divers here are watching one of the more heavily pressured shark species anywhere in its range, in one of the comparatively few places it still shows up reliably.
Beyond hammerheads, the reef walls carry sea fans, black coral trees, and dense nudibranch populations that draw macro photographers, dropping from a shallow flat down a near-vertical face into the channel’s deeper water. A modest American-era lighthouse on the island’s western point, likely built in the early 1900s under the U.S. Bureau of Lighthouses’ island-wide programme of shipping aids for the Camotes Sea and Bohol Strait passages, is reachable by a 30-minute walk through coconut groves from the resort area.
Cabilao came under Spanish administration as part of Loon parish, established in 1753 by Augustinian Recollect missionaries; archaeological shell middens on several northwest Bohol islands point to long-term pre-colonial habitation, evidence that people were working these reefs and shorelines long before either the parish register or the dive logbook existed. European — mostly German and Swiss — dive operators identified the hammerhead aggregations and opened the first small resorts in the 1990s, and the community-managed marine sanctuary protecting a reef section followed in the early 2000s, enforced through barangay-level bantay dagat patrols — volunteer sea wardens who patrol against illegal fishing methods such as dynamite and cyanide, a threat that had already damaged reefs elsewhere along this stretch of coast before the sanctuary model took hold here. Sanctuary income and dive-permit fees feed back into that patrol effort, one of the more direct examples on this coastline of tourism revenue funding its own conservation. The island’s patron, San Isidro Labrador, reflects the interior barangays’ farming character, while the coastal communities maintain a separate fishing identity with their own boat-blessing rituals; the island’s fishing catch — reef fish, squid, and locally dried fish — still supplies both household diet and the fixed meals resorts serve alongside their dive packages.
What’s here, briefly
- Hammerhead shark diving (Jan–Apr) — the main draw, with early-morning dives around 06:00 at sites like Cabilao Corner giving the best sighting odds.
- Wall and reef diving — drop-offs to 30–40 metres with large sea fans, black coral trees, and diverse nudibranchs.
- Community marine sanctuary — a no-take reef section patrolled by barangay bantay dagat wardens, funded partly by dive fees.
- American-era lighthouse — a modest, historically intact structure on the western point.
- Reef snorkelling — a shallow eastern reef flat accessible from the beach without a boat.
Getting there
From Tagbilaran, head northwest to Loon town proper — about 40 kilometres, roughly 1 hour by hired van or 1.5 hours by bus or jeepney from the integrated terminal (PHP 40–60). From Loon pier, pump boat crossings to Cabilao take 30–45 minutes; scheduled trips run irregularly, so a chartered bangka (PHP 500–800 one way) is the reliable option. Some dive resorts arrange direct van-and-boat transfers from Tagbilaran Airport, which removes the Loon-pier connection entirely for guests booked on a package.
Travel tips
Cabilao is a dive destination first — non-divers will find limited structured activity after half a day. Resort capacity is small, perhaps 30–50 beds across the island, so book ahead for the January–April season, when hammerhead-season demand overlaps with the general December–May dry-season crowd for Bohol diving generally. Rooms run PHP 1,500–3,500, usually on a meals-and-dives package basis, which is also how most visitors get their food — the island has little in the way of independent restaurants outside the resorts. There is no ATM on the island; bring sufficient cash from Tagbilaran, and a power bank for occasional outages, since resort generators don’t always run around the clock.
Outside the January–April hammerhead window, the wall and reef diving around Cabilao remains worthwhile on its own terms — the sea fans, black coral, and nudibranch density don’t disappear once the sharks move on, and currents along the wall tend to be milder in the calmer months, which suits less experienced divers better than the stronger channel currents that accompany peak hammerhead season. Visibility on the walls generally runs clearer than on Bohol’s more silt-affected coastal reefs closer to the mainland, a difference divers attribute to the channel’s depth and distance from river outflow.
Other places to consider
- Loon — the mainland municipality Cabilao is administratively part of.
- Calape — the neighbouring northwestern coastal town facing the same strait.
- Tagbilaran City — the provincial gateway for arranging transfers.
Location and travel detail reflect publicly available information as of 2026-07-16. Confirm boat schedules and resort availability before travel. bohol-philippines.com earns a commission on bookings made through partner links at no cost to you.