Coral Triangle · Indonesia
Cenderawasih Bay
Whale sharks feed under fishing platforms for one of diving's most reliable encounters.
Photo: Rogistira · CC BY-SA 4.0
Cenderawasih Bay, Indonesia's largest marine national park off West Papua's north coast, holds a population of whale sharks that has learned to feed at bagan fishing platforms, hovering under the lift nets to take small baitfish as they're raised. This behavior lets divers snorkel or scuba dive alongside whale sharks in open water essentially year-round, an unusually reliable encounter compared to seasonal aggregations elsewhere. The bay's isolation and lack of infrastructure mean it is reached almost exclusively by liveaboard.
About diving in Cenderawasih Bay
The days here do not look like normal diving. Boats tie up alongside the fishing platforms early and stay put, and the animals come to the boat rather than the other way round: divers drop in, hang under the nets and stay until they are cold or low on gas, then go again. Sessions run on snorkel or on scuba depending on the hour and the operator, and a code of conduct applies throughout, with no touching and a wide berth given to the flanks and tail. It is common to log more hours in the water across one of these days than on a conventional three-dive schedule.
Away from the platforms the bay is a large, quiet body of water ringed by fringing reef, sloping coral shoulders and the occasional wall or submerged pinnacle. Currents are usually gentle and the reef diving is unhurried. Hard coral is in good condition, though fish density is generally reported as lower than in the better-known parts of Papua, and the bay's long geological isolation has left it with fish found here and in few other places, which is much of what brings divers back a second time.
Itineraries generally work the platforms first and fill the rest with reef, jetty and the war material scattered around the bay: hulls and aircraft from the Pacific campaign, some shallow enough to dive, though identifications are often local and not always firm. Harbour wrecks near the gateway ports commonly bookend a route. Anchorages are far apart, so whole days go to steaming, and weather can reorder a schedule at short notice.
This is a destination for one thing done properly. If a repeatable, unhurried whale shark encounter justifies several flights and a long boat trip, the bay earns the effort; anyone after dense reef fish, varied macro or short travel is better served by Raja Ampat or Sulawesi. It also asks for self-sufficiency, since the bay is a long way from medical help, so conservative profiles, dive insurance and patience with delays matter more here than any particular skill in the water.
Best time to dive Cenderawasih Bay
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | Good | Good | Good | Good | Good | Prime | Prime | Prime | Prime | Prime | Good | Good |
| Sea surface | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F |
| Daytime high | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 29°C84°F | 29°C84°F | 29°C84°F | 30°C86°F | 30°C86°F | 31°C88°F | 30°C86°F |
| Rain | 275 mm10.8 in | 245 mm9.6 in | 321 mm12.6 in | 287 mm11.3 in | 253 mm10.0 in | 209 mm8.2 in | 219 mm8.6 in | 176 mm6.9 in | 181 mm7.1 in | 184 mm7.2 in | 242 mm9.5 in | 285 mm11.2 in |
| Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|
| Good | Good | Good | Good | Good | Prime |
| Sea surface | |||||
| 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F |
| Daytime high | |||||
| 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 29°C84°F |
| Rain | |||||
| 275 mm10.8 in | 245 mm9.6 in | 321 mm12.6 in | 287 mm11.3 in | 253 mm10.0 in | 209 mm8.2 in |
| Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|
| Prime | Prime | Prime | Prime | Good | Good |
| Sea surface | |||||
| 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F | 30°C86°F |
| Daytime high | |||||
| 29°C84°F | 29°C84°F | 30°C86°F | 30°C86°F | 31°C88°F | 30°C86°F |
| Rain | |||||
| 219 mm8.6 in | 176 mm6.9 in | 181 mm7.1 in | 184 mm7.2 in | 242 mm9.5 in | 285 mm11.2 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.
June to October is the main season, set by the boats rather than the whale sharks. From July to September wind and rain make the open waters around Raja Ampat rough, so liveaboards move into the sheltered bay, and most scheduled trips fall in these months. The sea is at its coolest then, around 27 °C. From November to May the sharks are still at the bagans and the water warms towards 30 °C, but fewer boats run routes here, so the choice of dates is thinner. Papua has two wetter spells, July to August and November to December, though rain can fall in any month. The sharks are young residents that stay in the bay for weeks at a time, so no month is closed.
Best months: June, July, August, September, October
Cenderawasih Bay water temperature and weather by month
The sea surface stays around 30 °C (86 °F) all year. Rain falls through the year, about 240 mm (9.4 in) a month on average, with March the wettest. Daytime highs sit around 30 °C (86 °F) all year. Below the surface the water can drop to about 27 °C (81 °F), so pack a 3 mm, or even a 2 mm, suit.
Dive types & marine life
The whale sharks at the platforms are mostly juvenile males of 4 to 5 m. Photo-identification has logged more than 150 individuals here since 2010, staying an average of 77 days; one returned after ten years. They feed vertically, tail down, and stay put, which is why sessions run to hours. Reef dives add reef sharks, turtles and napoleon wrasse, with dugongs an occasional bonus.
- Pelagic & blue water
- Reef
- Wall
- Whale sharks
- Reef sharks
- Sea turtles
- Dugongs & manatees
- Pristine corals
- Napoleon wrasse
Best dive sites in Cenderawasih Bay
- 1
Kwatisore Bagans
Lift-net platforms near Nabire where juvenile whale sharks feed at the surface all year.
- 2
Shinwa Maru
A 120 m Japanese transport on her side at 16–34 m near Manokwari, cargo still scattered around.
- 3
Tanjung Mangguar
Soft and whip coral reef with dense fish life and a manta and mobula cleaning station.
- 4
Flying Catalina
A PBY Catalina flying boat at 19–30 m off Biak, hung with black coral and glassfish.
- 5
Manim Island
More than seven WWII landing craft on a white-sand slope from 5 m to past 40 m.
- 6
Sungei Omiand
Black-sand muck site with pygmy seahorses, frogfish, snake eels and blue-ringed octopus.
- 7
Rouw Island P-38 Wrecks
Three American P-38 fighters in 2 m of water, as much a snorkel as a dive.
- 8
Pulau Purup
Sloping reef where the bay's endemic Walton's flasher wrasse displays over the coral.
Site guides
Wreck
A well-preserved PBY Catalina airframe with glassfish inside
Pelagic & blue water
Whale sharks feeding under lift nets, all year round
Wreck
Seven-plus landing craft on one sand slope, sharks when it runs
Three P-38 fighters in two metres of water
Wreck
A 120 m Japanese transport on her side, blast holes and all
How to get to Cenderawasih Bay
Access is overwhelmingly by liveaboard, with routes starting or finishing at Manokwari, Nabire or Biak, reached on domestic flights via Jakarta, Makassar or Sorong. A few small land-based operations run trips to the platforms from the Nabire side, but anchorages elsewhere in the bay are far enough apart that only a boat-based trip covers them.
Photos from Cenderawasih Bay
Bird's Head Seascape / Jones/Shimlock / Secret Sea Visions · CC BY-SA 4.0
Bird's Head Seascape / Jones/Shimlock / Secret Sea Visions · CC BY-SA 4.0
Eka feri · CC BY-SA 4.0
Rogistira · CC BY-SA 4.0
Dive videos
The Gentle Giants of Cenderawasih Bay (4K) · Simone Tomazela on YouTube
Diving with Whaleshark Nabire Papua Indonesia [HD] - The Blue of Cendrawasih Part 2 · Kaufik Anril on YouTube
Questions divers ask
Are the whale sharks in Cenderawasih Bay there all year?+
Yes. The sharks feed at the bagans, the lift-net fishing platforms, in every month, and photo-identified individuals stay in the bay for an average of 77 days, and one was seen again after more than ten years. What changes through the year is the weather and the number of liveaboards running, not the sharks.
How do divers get to Cenderawasih Bay?+
Almost always on a liveaboard of 7 to 10 nights, starting and ending at Manokwari, Nabire or Biak, or on a longer route combined with Raja Ampat from Sorong. The ports are reached on domestic flights through Jakarta, Makassar, Surabaya or Jayapura. A few small land-based operations near Nabire also run trips to the platforms.
What experience do I need for a Cenderawasih Bay liveaboard?+
Intermediate experience is the usual requirement. The whale shark sessions are shallow and suit newer divers, but some reef sites have moderate to strong currents, several wrecks lie deeper than 30 m, and the bay is a long way from medical help, so dive insurance and conservative profiles matter.
Is diving with whale sharks at the bagans ethical?+
It comes with trade-offs. The fishermen hand the sharks baitfish mainly to keep them out of the nets, not for divers, but a study across the region found about three in four sharks carrying injuries, many linked to fishing gear and boats, and called for bagan tourism to be managed carefully. Keeping distance and never touching help.
Sources
- Cenderawasih Bay diving: whale sharks and WWII wrecks — Dive The World
- Cenderawasih Bay Liveaboard Diving — Dive The World
- Population demographics and residency of photo-identified whale sharks in the Bird's Head Seascape — Frontiers in Marine Science
- Over a Decade of Research Reveals Whale Shark Population in Papua — Konservasi Indonesia
- Cenderawasih Bay — Wikipedia
Photo credits
- A whale shark swims through blue water beneath a sunlit surface in Cenderawasih Bay by Rogistira, CC BY-SA 4.0, via Wikimedia Commons
- Divers photograph and survey a coral reef in Cenderawasih Bay by Bird's Head Seascape / Jones/Shimlock / Secret Sea Visions, CC BY-SA 4.0, via Wikimedia Commons
- Two divers with cameras examine hard corals on a reef in Cenderawasih Bay by Bird's Head Seascape / Jones/Shimlock / Secret Sea Visions, CC BY-SA 4.0, via Wikimedia Commons
- A coral reef flat exposed at low tide below forested hills at Kwatisore, Nabire by Eka feri, CC BY-SA 4.0, via Wikimedia Commons
- Calm bay water with a reef visible through the shallows, forested headlands and a small outboard boat passing under a blue sky by Rogistira, CC BY-SA 4.0, via Wikimedia Commons
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