Snorkelling in Sabah

The short version

The offshore coral reefs

The Celebes Sea off Sabah's east coast holds fringing reefs and an oceanic pinnacle where marine turtles congregate in the sunlit upper 5 metres. You can explore these shallow coral drop-offs without a scuba tank, taking speedboats from Semporna or staying on the sandy outer islands. The water stays around 28 degrees, letting you comfortably look for bigeye trevally above the reef flat.

The best snorkelling in Sabah is found around the offshore islands. The mainland coast is fringed by mangroves where the water is murky and estuarine crocodiles are a documented risk. The clear water lies further out.

Off the east coast the Semporna archipelago holds the greatest concentration of coral reefs. These include Sipadan and the sandy islands of Mataking and Pom Pom. A typical day trip from Semporna town or an island resort involves a speedboat ride to a designated reef where the boat moors or drifts while you swim. The water temperature is generally warm enough for a rash guard and board shorts.

Up in the Sulu Sea Lankayan is a dedicated resort a boat ride from Sandakan. It closes every January and February for the north-east monsoon but offers excellent shallow reefs the rest of the year. On the west coast the islands off Kota Kinabalu offer accessible snorkelling a short boat ride from the city.

A snorkeller interacts with a different cross-section of marine life than a scuba diver. Divers descend deep along the drop-offs to intercept pelagic species like scalloped hammerhead sharks in the cold thermoclines. Snorkellers remain in the top 5 metres where sunlight fuels the coral growth. This shallow zone is exactly where green turtles graze on algae and where immense schools of bigeye trevally mill during the day. The sunlight brings out the colours of the reef fish and the corals in a way that is lost at depth.

The Sipadan pinnacle

Sipadan is an oceanic volcanic pinnacle rising 600 metres from the seabed. Sabah Parks issues 254 Sipadan permits a day. The island is closed every November and reopens on 1 December. Advanced Open Water certification has been required for divers since October 2022 and snorkellers also need a permit. The permit gives you access to exceptional snorkelling.

The reef flat extends a short distance from the beach before plunging vertically into the deep ocean. This shallow shelf is a highly productive environment. The pinnacle geology creates nutrient-rich upwellings that sustain dense algal ecosystems. The green turtle is classified as Endangered by the IUCN and congregates here in extraordinary numbers to feed. You can watch them grazing on the benthic algae right below the surface. Hawksbill turtles are Critically Endangered and use their narrow beaks to extract sponges from the reef matrix.

The schooling fish are the other main attraction. Bigeye trevally form dense swirling aggregations between 2 and 15 metres below the surface. They are highly tolerant of people in the water and you can often float above thousands of fish moving as a single shimmering entity. The chevron barracuda form their famous tornadoes slightly deeper at Barracuda Point but the top of the school is a realistic target. If you are in the water early enough, you might see the bumphead parrotfish. They sleep in the shallow lagoon and move along the reef edge at dawn to begin their daily feeding cycle. The bumphead parrotfish is assessed as Vulnerable by the IUCN and serves as the primary bioeroder of the reef.

Tun Sakaran Marine Park

The Tun Sakaran Marine Park covers roughly 350 square kilometres of ocean and islands north of Semporna. It was gazetted in 2004 and is managed by Sabah Parks. The island of Sibuan offers shallow drop-offs suitable for entry-level snorkelling. The reef at Mantabuan is the site of active marine rehabilitation where coral frames encourage the return of juvenile reef species.

A day trip here often combines snorkelling with a hike on Bohey Dulang. The steep trail is 600 metres long and leads to a viewpoint at 353 metres overlooking a flooded volcanic caldera. The hike is demanding in the tropical heat and requires proper closed-toe shoes. It is best to start early before the mass-market boats arrive mid-morning.

The Semporna region operates under the Eastern Sabah Security Zone dusk-to-dawn sea curfew. Tourist boat transfers and remote marine operations must conclude by mid-afternoon so vessels are ashore before 6pm. Your boat guide manages the schedule to ensure a timely return. You will spend the middle of the day hopping between reef sites and sandbars.

Be sure to ask your guide about the local Bajau Laut communities. These stateless maritime people live in wooden stilt houses and rely on subsistence fishing in the park. Snorkellers should respect their privacy by not taking unsolicited photographs of their homes or children.

The northern coral islands

The islands north of Semporna offer beach relaxation alongside time on the reef. Mataking is a 40-minute speedboat ride from the mainland. It sits on the edge of the Alice Channel where the reef wall drops abruptly to 100 metres. The snorkelling here offers a mix of macro life and passing pelagics. Pom Pom is a 45-minute boat transit from Semporna and features sloping fringing reefs. The island is home to the Tropical Research and Conservation Centre. Volunteers use micro-fragmenting techniques to accelerate coral growth and deploy artificial reef frames to stabilise the mobile rubble damaged by historical blast fishing.

Timba-Timba is a day-trip destination with a long sandbar that emerges at low tide. The snorkelling operations focus on the eastern reef drop-offs where you can find branching corals and marine turtles.

The islands of Mabul and Kapalai sit close to Sipadan and offer a different micro-ecosystem. The sandy and rubbly sea floor here supports extraordinary macro life like the flamboyant cuttlefish and the blue-ringed octopus. Snorkelling here demands exceptional buoyancy control because you must maintain a safe distance from the bottom. The blue-ringed octopus carries enough tetrodotoxin to cause severe respiratory failure. Its iconic blue rings only flash when the animal is stressed so you should never provoke one for a photograph.

Further north in the Sulu Sea the island of Lankayan is a dedicated resort. It sits inside a marine protected area and offers a superb house reef right off the beach. You can snorkel over hard corals and watch for passing turtles. Over on the west coast the islands of the Tunku Abdul Rahman Marine Park are a short boat ride from Kota Kinabalu. They provide an easy introduction to coral reefs for anyone staying in the city.

Family island resorts

Snorkelling is a brilliant way for families to explore the marine environment together. The islands of Mataking and Pom Pom are excellent choices for visitors with children. They offer wide sandy beaches and calm shallow lagoons where young swimmers can build their confidence. The water is warm and clear.

Pom Pom Island Resort manages a sea turtle hatchery certified by Sabah Parks. The beaches are a vital nesting ground for green and hawksbill turtles. The marine biology team patrols the sands to protect nests and relocates eggs to the secure hatchery. Children can learn about the conservation effort and watch baby turtles being released into the sea at sunset.

Lankayan also runs a successful turtle hatchery and the island's shallow house reef is highly accessible. The Kota Kinabalu islands are another convenient option for families who want to avoid long overland transfers. They offer easy day trips with plenty of time for playing on the beach and splashing in the shallows.

Currents and sea conditions

The sea conditions in Sabah dictate how and where you snorkel. The oceanic islands like Sipadan are swept by strong tidal currents. These water movements bring the nutrients that sustain the reef but they also require strong swimming skills. Snorkellers at Sipadan generally drift with the current alongside the reef wall while the boat follows at a safe distance.

The shallower reefs inside Tun Sakaran Marine Park and around the northern islands tend to have milder water movement. Your guide will assess the tide and the wind before choosing the best entry point. Always listen to the briefing and stay within sight of your boat.

The Semporna archipelago is affected by the north-east monsoon from November through February. The outer islands experience elevated swells and surface chop during these months. The boat transits can be physically demanding and heavy rain occasionally closes the Bohey Dulang trail. March and April are generally the calmest and least wet months around Semporna and its islands.

The estuarine and riparian networks flowing into the Sabah coast are the domain of the estuarine crocodile. These rivers and coastal mangroves are never safe for swimming or independent snorkelling. You must stay entirely within the safety of your vessel when navigating these waterways.

Be sure to wear a life jacket if you are not a confident swimmer. Choose an operator that provides high-quality gear and makes sure everyone follows the life-jacket briefing.

Coral reef conservation

Coral reefs are fragile living ecosystems. A single careless kick can destroy decades of slow coral growth. The absolute rule of reef etiquette is to never stand on the coral. If you need to adjust your mask or rest, you should float on your back or swim to a patch of bare sand.

Skin protection is essential in the tropical sun. The most effective defence is a long-sleeved rash guard and swimming leggings. These protect your skin from ultraviolet rays and minor jellyfish stings without introducing chemicals to the water. If you must use sunscreen, you should choose a reef-safe formula that does not contain oxybenzone or octinoxate.

Maintain a respectful distance from all marine life. Do not chase turtles or block their path to the surface for air. Touching or holding a marine animal is a severe violation of park regulations. Sabah has experienced mass bleaching events including one in mid-2024 that affected the shallow flats at Tun Sakaran and Mabul. The reefs are under thermal stress and responsible snorkelling helps limit further human impact.