Monday, 20 Oct 2025

Top 6 Marine Species You Can Encounter While Diving in Maratua

Few places in the world can rival the untouched beauty of Maratua Island. Nestled in the Derawan Archipelago, East Kalimantan, this small crescent-shaped island has earned a global reputation as one of Indonesia’s best diving destinations. The crystal-clear waters, healthy coral reefs, and thriving marine biodiversity make every dive here unforgettable.

If you’re planning a diving trip to Indonesia, here are six extraordinary marine species that will make your Maratua adventure truly special.

The Rich Marine Biodiversity of Maratua

Maratua lies at the heart of the Coral Triangle, often called the “Amazon of the Ocean,” home to 76% of the world’s coral species. This nutrient-rich ecosystem supports an astonishing variety of marine life—from tiny nudibranchs to massive whale sharks. The surrounding areas like Kakaban Island and Sangalaki are also world-renowned dive sites that attract both professional divers and marine researchers. Each dive promises new surprises, revealing the vibrant balance between reef life and pelagic species that define this underwater paradise.

1. Whale Sharks

Meeting a whale shark in Maratua is a once-in-a-lifetime experience. Despite their massive size, these filter-feeding giants are incredibly gentle. They can often be found near Sangalaki and Kakaban, gracefully gliding through the open blue. Diving alongside a whale shark offers an unforgettable moment of connection with nature’s largest fish. Remember to keep your distance and never touch—these giants deserve our respect and protection.

2. Manta Rays

Known as the “ballerinas of the ocean,” manta rays captivate divers with their slow, elegant movements. Around Sangalaki Island, mantas often gather at cleaning stations where small fish help remove parasites from their wings. Watching these creatures perform their underwater ballet is both calming and awe-inspiring. Because mantas are a vulnerable species, eco-diving guidelines are crucial to ensure their safety for future generations.

3. Green Sea Turtles

Maratua is also home to one of Indonesia’s most important green sea turtle habitats. You’ll often find them resting on coral ledges or gracefully swimming through channels. Many of these turtles nest along the sandy beaches of Maratua, creating an incredible opportunity for visitors to witness the circle of marine life. Always keep your distance, avoid flash photography, and appreciate their ancient beauty from afar.

4. Barracudas

One of the most thrilling experiences in Maratua is diving through the famous “Big Fish Country”, where hundreds of barracudas form a swirling silver vortex around you. These sleek predators move in perfect unison, creating an incredible underwater spectacle. Advanced divers often seek this dive for the adrenaline rush and the dramatic photography it offers. With strong currents, it’s an exciting challenge for experienced divers looking for something truly unforgettable.

5. Reef Sharks

Maratua’s reef systems are patrolled by blacktip and whitetip reef sharks—symbols of a healthy marine ecosystem. Though often misunderstood, these sharks are calm and rarely aggressive toward divers. Spotting them during a drift dive along the channel is exhilarating, as they glide effortlessly through the currents. Protecting these apex predators is essential, as they help maintain balance within the reef ecosystem.

6. Parrotfish & Napoleon Wrasse

Amid the coral gardens, you’ll find brightly colored parrotfish and the majestic Napoleon wrasse, two key species vital to coral reef health. Parrotfish clean the reefs by feeding on algae, while the large, blue-green Napoleon wrasse adds a rare and royal touch to the underwater scene. Sadly, both species face threats from overfishing, so witnessing them in Maratua is a precious reminder of why marine conservation matters.

Responsible Diving, Protecting Maratua’s Marine Heritage

Diving in Maratua means becoming part of its conservation story. Always follow eco-diving practices: avoid touching corals, control your buoyancy, and never feed marine animals. Local dive operators and resorts, including Sienna Resort Maratua, work closely with conservation groups to preserve the area’s marine ecosystem. By diving responsibly, you help ensure Maratua’s underwater paradise remains vibrant for generations to come.

Plan Your Dive Trip to Maratua

The best time to dive in Maratua is between March and October, when visibility reaches up to 30 meters and marine life is most active. Access is typically via Berau or Tarakan, followed by a scenic boat ride to the island.

For an unforgettable stay, book your dive holiday with Sienna Resort Maratua. Located right by the sea, Sienna offers easy access to top dive spots, professional dive guides, and eco-friendly accommodation surrounded by natural beauty. Whether you’re exploring manta cleaning stations or watching turtles hatch at sunrise, Sienna Resort brings you closer to the ocean’s heart.

Conclusion

Maratua isn’t just another dive destination—it’s a living, breathing marine sanctuary where every dive reveals a new story. From majestic whale sharks to tiny seahorses, the waters here invite you to explore, respect, and fall in love with the ocean all over again.