Dive Site: Channel Maratua

Dive site facts: Channel Maratua

Depth

5–40 m

Typical dive

5–30 m, 50–60 min

Current

Strong to very strong, tide-dependent

Visibility

10–25 m+

Water temperature

26–30°C

Entry

Boat / negative entry

Level

Advanced, current experience

Dive type

Drift, wall, pelagic

Night dive

Possible

Region / port

East Kalimantan, Borneo

Coordinates

4.5765° S, 123.8836° E

Conditions & Currents

Channel Maratua is defined by its powerful and highly variable currents, which can range from strong to very strong, making it a challenging dive. The currents are tide-dependent, dictated by the ebb and flow of water into and out of the Maratua atoll lagoon. Divers must plan their entry and exit meticulously, often with negative entries to quickly reach the desired depth and avoid being swept away. Divers should be proficient in drift diving techniques and comfortable using reef hooks to maintain position against the strong flow, particularly when observing schooling pelagics like barracuda and jacks. Surface marker buoys and whistles are essential safety equipment. Visibility typically ranges from 10 to 25 meters, but can fluctuate with plankton blooms, which, ironically, can sometimes attract more large marine life. Water temperatures are consistently warm, between 26-30°C, though the

Marine life & sighting chances

Barracuda

March to December · common

Jack

March to December · common

Reef shark

March to December · common

Whale shark

March to June and September to December · occasional

Hammerhead shark

occasional

Thresher shark

occasional

Leopard shark

March to December · occasional

Oceanic manta ray

March to December · common

Eagle ray

occasional

Bumphead parrotfish

March to December · common

Green sea turtle

March to December · common

Dive profile & how the dive runs

Diving Channel Maratua is a scheduled activity, heavily reliant on tidal tables to ensure optimal conditions. Typically, the dive begins with a boat entry, often a negative entry due to the strong currents. Divers quickly descend to depths around 30 meters along the reef edge or channel entrance. The main objective is to position oneself to observe schooling barracuda and jacks that gather in the strong flow, often utilizing reef hooks to hold stable positions against the current. This allows for prolonged observation of the pelagic action without expending excessive energy. The dive usually progresses as a drift, following the channel’s natural flow. Safety stops are conducted during the final drift phase, often at 5 meters for 3 minutes, before a surface marker buoy is deployed for boat pick-up, potentially a distance from the initial entry point due to the drift.

Underwater photography

Channel Maratua is ideal for wide-angle photography, focusing on the impressive schools of barracuda, jacks, and various shark species attracted by the strong currents. A fisheye or wide-angle rectilinear lens will capture the scale of these pelagic aggregations and the expansive blue water environment. External strobes are beneficial for adding color and definition, especially when shooting into the blue. Due to the powerful currents, excellent buoyancy control is paramount to maintain position and avoid stirring up sediment, which can reduce visibility for subsequent shots. Be mindful of ethical behavior around large animals, avoiding disruptive movements or close approaches. Patience is key, as the action can unfold quickly; be ready to capture dynamic feeding or schooling behaviors.

Combine with nearby dive sites

• Turtle Traffic

  A wall dive off Maratua known for abundant green sea turtles.

• Big Fish Country

  Another name for Channel Maratua itself, highlighting its pelagic focus.

• Kakaban Jellyfish Lake

  A unique brackish lake on Kakaban Island with stingless jellyfish, primarily for snorkeling.

• Derawan Islands

  The broader archipelago encompassing Channel Maratua and other sites.

• Sangalaki

  Known for manta ray cleaning stations and turtle nesting.

Getting there & logistics

Access to Channel Maratua typically begins with arrival at Kalimarau Airport (BEJ) in Berau, East Kalimantan. From there, transfers are arranged, usually involving a combination of car and speedboat, to reach Maratua Island or nearby logistical hubs like Derawan Island. Liveaboards frequently include Maratua in their itineraries, offering comprehensive access to remote sites. Resorts, such as Sienna Resort, are located just five minutes from Channel Maratua, providing convenient day boat access. Dive trips to the Derawan Archipelago often range from 3-day/2-night to 4-day/3-night packages, running from April to November. Permits or park fees are generally included in liveaboard or resort packages. Combining this site with others like Sangalaki and Kakaban is standard for a full Derawan diving experience.

Safety & environment

Diving Channel Maratua requires a high level of dive experience and adherence to stringent safety protocols due to the very strong and unpredictable currents. All divers should be Advanced certified and proficient in drift diving, current management, and emergency procedures. Essential safety equipment includes a surface marker buoy (SMB), a whistle, and ideally a reef hook. Maintaining excellent buoyancy control and conservative no-decompression limits is crucial. In the event of an emergency, the nearest recompression chamber would likely be in a larger city like Balikpapan or Makassar, implying a significant evacuation time that underscores the importance of prevention. Dive insurance covering medical emergencies and evacuation is strongly recommended. Always follow your guide's instructions precisely, as site conditions can change rapidly based on tides.

Who it suits, and who it doesn't

FAQ

Channel Maratua FAQ

Liveaboards diving Channel Maratua

These liveaboards may visit Channel Maratua on selected itineraries, the exact dive sites depend on departure, weather and conditions.

Panunee

Indonesia

18 guests38 m

Naga Biru

Indonesia

12 guests40 m

Ecopro Duyung Baru

Indonesia

6 guests27 m

Jaya

Indonesia

14 guests23 m

Wellenreng

Indonesia

9 guests25 m

Komodo Aggressor

Komodo, Indonesia

16 guests29 m

Blue Manta

Indonesia

20 guests45 m

Mari

Indonesia

14 guests32 m

Situju7

Komodo, Indonesia

10 guests33 m

Pindito

Indonesia

16 guests38 m

Mermaid II

Komodo, Indonesia

18 guests

Pearl of Papua

Raja Ampat, Indonesia

14 guests30 m