Most people flying into Semporna have their eyes fixed on Sipadan, Mabul, or the turquoise postcards of Tun Sakaran Marine Park. Barely a kilometre away sits Bum Bum Island, the place divers photograph in passing from the back of a speedboat but rarely actually stop at, and it might be the most quietly interesting stop in the whole archipelago.

Read more: 8 Fun Things to Do in Semporna, Sabah in 2026: Islands, Reefs, and Marine Life

Bum Bum Island is a genuinely large island, roughly 42 square kilometres, sitting just across the narrow Terusan Tando Bulong channel from Semporna town. Around 20,000 people live there, spread across 34 villages and small hamlets that ring the coastline.

That size and population make it something closer to Semporna's larger, greener, quieter twin than a typical offshore island escape. Its proximity is really its whole identity, close enough to visit on a whim, far enough to feel like an entirely different pace of life.

Bum Bum Island is predominantly home to the Bajau Laut, a seafaring people known internationally as Sea Gypsies for their generations of free-diving and spear-fishing skill. Traditional stilt houses line much of the coast, connected walkways stretching out over the water rather than solid ground.

Seaweed farming has grown into the island's main economic pillar alongside fishing, with visible seaweed lines strung across shallow water near many of the villages. Walking through one of these communities offers a rare, unfiltered look at coastal Sabah's everyday life, the kind most dive tourists only glimpse from a moving boat.

Read more: The Ultimate Travel Guide to Semporna, Sabah: Diving, Island Hopping, and Everything You Need to Know

A slow walk through village life is the main draw here, stilt architecture, seaweed platforms, and fishing boats coming and going without any performance for visitors. Overwater resorts like Bum Bum Bay Resort have also opened along the coast, offering wooden chalets with a direct line of sight toward the Bohey Dulang volcanic crater.

From a base here, a quieter trio of nearby islands is reachable too, home to the country's only submerged mailbox and a tidal sandbar that appears and disappears with the tide. Sea turtles show up regularly in the shallow coral beds nearby, and Tun Sakaran Marine Park itself sits just a 20-minute boat ride away for anyone wanting to combine the culture with a proper snorkel.

Bum Bum Island isn't a polished, resort-built tourist destination, and it's worth going in with that expectation set correctly. Some visitors have flagged real concerns about waste management, with garbage and sewage occasionally channelled straight into the sea around parts of the coastline.

Respect matters more here than at a typical beach resort too. Dressing modestly and asking permission before photographing anyone in the villages isn't just polite, it's the basic price of being welcomed into someone's home rather than treated as a nuisance passing through.

Read more: 8 Fun Things to Do in Semporna, Sabah: Islands, Reefs, and Marine Life

Semporna's dry season, roughly March through October, brings the calmest seas and clearest skies for both the boat crossing and any snorkelling around Bum Bum's coastline. That window lines up with the rest of Sabah's east coast, since the same weather patterns govern the whole Semporna archipelago.

November through February brings rougher water and a real chance of disrupted boat schedules, worth factoring in if a specific date matters to your plans. Outside of weather, checking tide times ahead of a visit to the nearby sandbar and mailbox pays off too, since both only reveal themselves properly at low tide.

There's no direct flight to Semporna itself, so the standard route runs through Tawau. A direct flight from Kuala Lumpur to Tawau takes around 2 hours 45 minutes to 3 hours on AirAsia, Malaysia Airlines, Firefly, or Batik Air, several of which run daily.

From Tawau Airport, it's roughly a 1 to 1.5 hour drive to Semporna town, where boats to Bum Bum Island depart from the jetty. The final crossing itself takes only minutes, given the island sits barely a kilometre offshore.

Even though Sabah is part of Malaysia, it runs its own immigration checkpoint separate from the Peninsula, a holdover from the state's 1963 terms of entry into the federation. Travellers from Kuala Lumpur or anywhere else in the Peninsula still pass through this checkpoint on arrival, though no visa or special approval is actually required.

An IC is enough to get through for a standard visit, typically valid for up to 90 days, with an entry slip issued in place of a passport stamp. Carrying an actual passport instead tends to make the process a little faster, since it just gets stamped rather than requiring a separate paper slip.

Bum Bum Island rarely makes sense as a standalone destination, it works best as one stop inside a bigger Semporna or Sabah itinerary. Traveloka, the #1 All-in-one Travel App in SEA*, can help pull that wider trip together rather than leaving you to book each leg separately.

Flights to Tawau and hotels across Sabah both come with Best Price Guarantee and 24/7 live agent support, plus access to 2 million plus properties worldwide. That's useful given how many moving parts a Semporna trip involves, flight, land transfer, and boat, all before you even reach the water.

The app also covers Sabah tours and island-hopping activities, which makes stringing together Bum Bum, Tun Sakaran, and the wider marine park considerably less of a logistical headache. It's worth checking current Traveloka promos before booking, since Sabah flight deals do turn up fairly often.

T&Cs apply. *#1 in cumulative downloads (2014 to 2025) among Travel Booking services apps. Source: SensorTower.