Dive Site: Lonos Marine Sanctuary

About Lonos Marine Sanctuary

Lonos Marine Sanctuary is a protected dive site situated in a tranquil bay near Tiamban Beach in Romblon, Philippines. Its establishment focuses primarily on the conservation of giant clams (Tridacna gigas), making it a unique location for observing these magnificent molluscs. The sanctuary is part of Romblon's diverse underwater landscape, which lies at the tip of the Verde Island Passage, recognized as a global center of marine biodiversity. Depths at Lonos accommodate a range of divers, though specific depth bands are not detailed in general overviews. The sanctuary's topography likely includes reef structures that support the giant clams and other marine organisms. Romblon's waters generally offer visibility between 15 to 30 meters and warm temperatures ranging from 26°C to 30°C year-round, contributing to comfortable diving conditions. The marine life here is particularly appealing to macro enthusiasts, with sightings of ornate ghost pipefish, spindle cowries, various crustaceans, and numerous nudibranch species. While a serene dive, the presence of these smaller, often cryptic creatures demands a keen eye and slower pace. The best conditions for visiting Romblon, and by extension Lonos, typically span from November to May. Diving Lonos Marine Sanctuary provides an intimate experience, often uncrowded, allowing divers ample time to explore its unique inhabitants. It's an ideal spot for those seeking quiet observation and macro photography, offering a window into the rich biodiversity of the Coral Triangle.

Dive site facts: Lonos Marine Sanctuary

Depth

12 m

Current

Mild

Visibility

15–30 m

Water temperature

26–30°C

Entry

Boat

Level

All levels

Dive type

Macro, marine sanctuary

Region / port

Romblon, Philippines

Coordinates

11.2554° N, 122.0332° E

Conditions & Currents

Romblon's dive sites, including Lonos Marine Sanctuary, generally experience mild currents, making them suitable for most experience levels. While shallower areas are often quite calm, some deeper sections of Romblon can encounter moderate flow, though specific current conditions for Lonos are not detailed. Visibility consistently ranges from 15 to 30 meters (50 to 100 feet), providing clear views of macro critters and giant clams. Water temperatures remain comfortably warm, typically between 26°C and 30°C (80°F to 86°F) throughout the year. Divers should always practice good buoyancy control to avoid disturbing the delicate protected marine life, particularly the giant clams and smaller macro subjects. Entry is typically via boat, offering a controlled start to the dive.

Marine life & sighting chances

Giant clam

common

Ornate ghost pipefish

occasional

Spindle cowrie

occasional

Crustaceans

common

Nudibranchs

common

Dive profile & how the dive runs

A dive at Lonos Marine Sanctuary generally commences with a boat entry into the protected bay. Divers typically descend to observe the giant clams, which are a primary focus of the sanctuary. The dive then proceeds to explore the surrounding reef and sandy areas, searching for the array of macro critters that inhabit the site. While specific depth progressions are not detailed, divers can expect to explore areas where ornate ghost pipefish, spindle cowries, crustaceans, and various nudibranchs are frequently found. The dive route often involves a meticulous search along the seabed and among coral formations, emphasizing slow, careful movement to spot cryptic marine life. The turning point is usually determined by air consumption or bottom time, with the ascent being gradual. A safety stop at 5 meters provides an opportunity to observe shallower reef life before surfacing.

Underwater photography

Lonos Marine Sanctuary is a prime location for macro photography, making a dedicated macro lens essential for capturing its tiny inhabitants. Photographers should prioritize excellent buoyancy control to avoid stirring up sand or damaging delicate corals, as many subjects are found close to the substrate. Snoots or off-camera strobes can effectively highlight small critters like ornate ghost pipefish and nudibranchs against their backgrounds, adding depth and detail. Patience is key, allowing sufficient time to locate and compose shots of well-camouflaged species such as spindle cowries and various crustaceans. Given the focus on conservation, photographers must maintain a respectful distance from the giant clams and other protected marine life, ensuring no contact or disturbance.

Combine with nearby dive sites

• The House Reef

  Accessed from Three P Holiday & Dive Resort, known for macro critters

• Agnay Fish Sanctuary

  Sheltered bay with Acropora corals, shoaling fish and rays

• The Rope

  Known for rare critters like Stiliger sp., Costasiella sp. and skeleton shrimp

• Bangug Island

  Small island with soft corals, pygmy seahorses, and hairy shrimp

• Bonbon Beach

  Diverse coral species and marine life, suitable for night dives

Getting there & logistics

Access to Romblon, and subsequently Lonos Marine Sanctuary, often involves travel from Manila, which can be an extended journey, typically around 18 hours including ferry connections. The nearest major airport with regular flights would typically be to a larger island in the Visayas, followed by onward travel to Romblon Island. Dive packages are available for all experience levels, often including guided dives with experienced spotters specializing in macro life. Romblon is recognized for its uncrowded dive sites, allowing for a serene underwater experience. Typical dive operations are centered around Romblon Island, with local dive centers organizing boat trips to sites like Lonos. As a marine sanctuary, adherence to local regulations and ethical diving practices is paramount.

Safety & environment

Diving in Romblon, including Lonos Marine Sanctuary, is generally considered safe due to mild currents and warm waters. However, divers should always carry appropriate dive insurance that covers medical emergencies and potential evacuation. The nearest recompression chamber and advanced medical facilities might be located on larger neighboring islands or in Manila, making evacuation a potential reality in case of a serious dive accident. It is crucial to dive within certification limits and follow the guidance of local dive guides. Respecting the sanctuary's protected status means avoiding touching any marine life, especially the giant clams, and maintaining excellent buoyancy control to prevent damage to the delicate ecosystem. Night dives, if offered, require additional caution and specialized training.

Who it suits — and who it doesn't

FAQ

Lonos Marine Sanctuary FAQ

Liveaboards diving Lonos Marine Sanctuary

These liveaboards may visit Lonos Marine Sanctuary on selected itineraries — the exact dive sites depend on departure, weather and conditions.

Infiniti

Philippines

25 guests39 m

$280/day

Seadoors

Philippines

16 guests25 m

$335/day

Resolute

Philippines

16 guests34.6 m

$314/day

Dolphin

Philippines

18 guests31 m

$326/day

Navis 1

Philippines

22 guests23 m

$250/day

Philippine Siren

Philippines

16 guests

$309/day

Palau Sport

Philippines

24 guests38.35 m

$215/day

Philippines Aggressor

Philippines

26 guests42.7 m

$381/day

Stella Maris Explorer

Philippines

20 guests33 m

$398/day

Solitude One

Philippines

24 guests52 m

$460/day

Atlantis Adventurer

Philippines

16 guests32.5 m

$421/day

Philippines Aggressor II

Philippines

26 guests42.7 m

$247/day