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Diver exploring a vibrant underwater shipwreck in clear blue Arabian waters.
📷 Ayden Zaki · Pexels

Dive site

3.8 — based on 24 community signals
4.1 12 species 13 contributors

Explore Fort Kalamata's underwater ruins off Ternate Island in the Maluku Islands. Year-round diving with diverse marine life and historical intrigue.

⭐ Best for intermediate divers.

updated 4 months ago
Difficulty
Intermediate
WreckBleachingRiskPhotoFriendlyHistoricalSite

At a glance

Activity
dive
Difficulty
intermediate
Best months
Year-round

Map

This spot POIs Airport Nearby spots
Dive site location map © Google · Map data © Google, contributors
Open in Google Maps

Conditions today

Conditions

Open-Meteo
Wind
3.1 kn
Wave
0.44 m
Water
27.1°C
N E S W
Wind direction (7d)
Primary: SSW (57%)
Now: S (184°)
Tide (7 days)
range: 1.08m

Next: Low at 04:00 (+0.35m)

+1.1 m0 m-0.0 m
▼ 04:00 · +0.35m ▲ 07:00 · +0.4m ▼ 13:00 · +0.18m ▲ 22:00 · +0.75m
Sat 19Sun 20Mon 21Tue 22Wed 23Thu 24Fri 25
UV8.45 · very high Air PM2.513 · moderate 06:20 18:27
Day Wind Wave UV Rain
09-19 10.1 0.6 8 0mm
09-20 8.5 0.54 9 0mm
09-21 9.6 0.48 9 0mm
09-22 7.7 0.42 9 0mm
09-23 8.4 0.36 9 0mm
09-24 8.1 0.34 9 0mm
09-25 6.2 0.26 9 2mm
⚠ Coral bleaching: Watch — favorable conditions

About this spot

Fort Kalamata sits on Ternate Island in Indonesia's Maluku Islands, a region steeped in maritime history and natural richness. The dive site centers on the submerged remains of this historical fort, offering a unique blend of cultural exploration and marine observation. The site attracts divers interested in wreck and historical diving combined with tropical reef environments. The Maluku Islands sit within one of the world's most biodiverse marine zones. Fort Kalamata's waters host 12 recorded species observations, indicating consistent marine activity year-round. Local community videos document the site's conditions and wildlife, providing divers with real-world footage before planning visits. Diving here is possible throughout the year, making it accessible for flexible travel schedules. The site remains outside marine protected areas, though coral health warrants attention—the region is under coral bleaching watch. This makes Fort Kalamata a timely destination for divers who want to document and experience these ecosystems before conditions shift further. Access to Ternate is straightforward via Ternate International Airport, with dive operators available locally. The combination of historical context, marine biodiversity, and year-round accessibility makes Fort Kalamata a compelling choice for divers seeking something beyond standard reef dives.

📖 Guide: Diving in Indonesia: 323 Sites, Mantas to Micro-critters

Best months

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Dive types

WreckReef

Trip essentials

Everything you need before you pack — checklist, sun, logistics.

Trip checklist

  • 🛂 Visa-free or visa-on-arrival
  • 📜 C-card + dive insurance (DAN)
  • 📔 Dive logbook
  • 🧴 Reef-safe sunscreen SPF 50+
  • 🔌 Plug type C/F · 230V adapter
  • 💊 Seasickness meds + ear drops
  • 📱 Offline maps + emergency contact

Quick facts

  • 🌓 Moon First quarter · 47%
  • GPS
Sustainability disclosures
🌍 CO2 footprint LHR ↔ 12433km · ~2860kg · €51

From your departure country

United States
Origin score: 54/100
  • Visa: Visa on arrival · 30 days max
  • Flight: 12h · direct
  • Jet-lag: 12h east · 8 days recovery

FAQ

When is the best time to dive Fort Kalamata?

Fort Kalamata is diveable year-round, so you can plan your trip based on your schedule rather than seasonal windows. Check current conditions with local operators before booking, as weather can vary monthly.

What will I see underwater at Fort Kalamata?

The site features the submerged fort structure plus 12 recorded marine species in the area. Expect a mix of historical ruins and reef life typical of the Maluku Islands' tropical waters.

Is Fort Kalamata a protected marine area?

No, Fort Kalamata is not within a marine protected area. However, the region is under coral bleaching watch, so the ecosystem warrants careful observation and responsible diving practices.

How do I get to Fort Kalamata?

Fly into Ternate International Airport, then arrange transport to Ternate Island where the fort is located. Local dive operators can coordinate boat access to the dive site.

Recently spotted by divers

iNaturalist →

Verified marine species observations

70 records · 50 species · sources: OBIS, GBIF

Ascarosepion latimanus

Cephalopoda · Sepiidae
GBIF
Last seen:
21 Feb 2026
×1records

Phyllidia varicosa

Gastropoda · Phyllidiidae
GBIF
Last seen:
15 Mar 2025
×3records

Phyllidia picta

Gastropoda · Phyllidiidae
GBIF
Last seen:
15 Mar 2025
×2records

Leander plumosus

Malacostraca · Palaemonidae
GBIF
Last seen:
15 Mar 2025
×1records

Hypselodoris tryoni

Gastropoda · Chromodorididae
GBIF
Last seen:
15 Mar 2025
×1records

Vir colemani

Malacostraca · Palaemonidae
GBIF
Last seen:
15 Mar 2025
×1records

Goniobranchus kuniei

Gastropoda · Chromodorididae
GBIF
Last seen:
15 Mar 2025
×1records

Lobactis scutaria

Anthozoa · Fungiidae
GBIF
Last seen:
15 Mar 2025
×1records

Caloria indica

Gastropoda · Facelinidae
GBIF
Last seen:
15 Mar 2025
×1records

Phyllidia ocellata

Gastropoda · Phyllidiidae
GBIF
Last seen:
15 Mar 2025
×1records

Odontodactylus scyllarus

Malacostraca · Odontodactylidae
GBIF
Last seen:
15 Mar 2025
×1records

Conus marmoreus

Gastropoda · Conidae
GBIF
Last seen:
15 Mar 2025
×1records

Data: 187,991 observations from OBIS (Ocean Biodiversity Information System) and GBIF (Global Biodiversity Information Facility). CC-BY 4.0.

See this spot in action

YouTube videos — click to play.

KOMODO DIVING | Manta Mania | Crazy Currents | Indonesia

DEEPAK WILDVISIONS
💬 3 top comments
  • Absolutely stunning - what views 😍 amazing clarity, beautiful detailing and so well shot. Waiting for more!! #DeepDives 🙌

    @adityaagarwal8550 · 👍 1
  • Would love to dive in Komodo islands someday. Loved the Manta rays and sharks. Cinematic! ❤❤❤

    @nidhisanghai5378 · 👍 2
  • Amazing marine lives~ Amazing photographer~ Thank you for giving us a wonderful summary

    @JANE-v3m5c · 👍 2

My Favourite Place on Earth | Indonesia’s Underwater Eden | Raja Ampat, Misool

SAM INDOWILD
💬 3 top comments
  • Hey Sam! What a stunning video—you really captured the magic of this expedition. I’m so glad we got to share this journey, and there’s so much more ahead… If anyone out there feels inspired to join one of our upcoming expeditions or plan a private cruise to the most remote corners of the Indonesian archipelago, you’ll find me online—don’t hesitate to reach out! And if you loved this film, help Sam

    @konjocruisingindonesia1053 · 👍 133
  • This is Nat Geo quality. Excellent. Thanks for posting this

    @philippserrin8268 · 👍 176
  • It is wonderful that Indonecia treasures and protects this natural paradise.

    @atanacioluna292 · 👍 67

Better than Raja Ampat? Expedition to Indonesia's Untouched Reefs | Halmahera, Maluku

SAM INDOWILD
💬 3 top comments
  • Halmahera… My first trip there was back in 2014, and I was completely blown away by the world-class diving and the endless rocks and underwater pinnacles waiting to be explored. Even just looking at the marine charts made me incredibly excited. Today, Halmahera is finally starting to gain recognition as one of Indonesia’s top diving destinations. If any of you would like to explore North Maluku,

    @konjocruisingindonesia1053 · 👍 91
  • How the hell do you only have 37k subs???? This was Natgeo quality.

    @Chica1937 · 👍 134
  • the scars on the sharks heads are from digging into coral crevaces for fish

    @bobjacobs-x1i · 👍 65
wind peaks Feb-Jul-Jan, calmest Nov-Jun-May.

5-year monthly climate

60 samples
0 5 10 15 20 25 JFMAMJJASOND
p25–p75 range Median Wind (kn) Air (°C)

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