Sabah

Kinabatangan River: The Kinabatangan is Sabah's longest river and one of the most reliable places in Borneo to see wildlife from a boat without deep jungle trekking — proboscis monkeys, orangutans, pygmy elephants (seasonally), monitor lizards, and a huge variety of birds along the riverbanks, viewed on guided boat cruises timed for dawn and dusk when animals are most active. Most visitors stay at a riverside lodge for 2-3 nights, since the wildlife-viewing rhythm here is built around multiple cruises across different times of day rather than a single outing, and lodges typically bundle meals, cruises, and transfers from Sandakan into one package.

Kota Kinabalu is the gateway to Sabah and, by extension, to Borneo's headline attractions - Mount Kinabalu (Southeast Asia's highest peak outside New Guinea), orangutan sanctuaries, and some of the region's best diving around Sipadan and the smaller islands offshore. The city itself is workmanlike rather than beautiful, a mid-sized waterfront town rebuilt after WWII bombing with a modern skyline, but it earns its keep as a logistics hub and has a genuinely spectacular sunset over the South China Sea most evenings, best watched from the waterfront near the Filipino Market seafood stalls. Tunku Abdul Rahman Marine Park, a cluster of five islands just a short boat ride from the city jetty, is a legitimate day-trip beach and snorkeling escape without needing to travel far - useful if you're short on time and want island water without committing to Semporna or the Perhentians. KK is also the standard base for climbing Mount Kinabalu, a two-day trek that requires permits and mountain guides booked well in advance (slots fill up, especially in peak season), and for day trips to Kundasang and the Kinabalu Park area even if you're not summiting.

Sandakan is a working timber-and-port town on Sabah's east coast whose real draw isn't the town itself but the wildlife-rich hinterland around it. The Sepilok Orangutan Rehabilitation Centre is the headline attraction, a rescue and rehabilitation sanctuary where you can watch semi-wild orangutans come in for supplementary feeding, alongside an adjacent Bornean Sun Bear Conservation Centre for the world's smallest bear species. From Sandakan, the Kinabatangan River is Malaysia's best accessible spot for wildlife river cruises - proboscis monkeys, orangutans, pygmy elephants (seasonally), crocodiles, and hornbills are all realistic sightings from a small boat at dawn or dusk, and it's generally reached via a lodge stay of one or two nights rather than a day trip given the distance. Sandakan town also carries some somber WWII history (it was the starting point of the Sandakan Death Marches, one of the worst atrocities against Allied POWs in the Pacific theater), commemorated at the Sandakan Memorial Park on the site of the former POW camp.

Semporna itself is not a destination - it's the unglamorous gateway town to some of the best diving in the world, most famously Sipadan, an oceanic island drop-off that Jacques Cousteau once called one of the finest dive sites he'd ever seen, known for huge schools of barracuda and jack, resident green and hawksbill turtles, and sheer wall dives. Access to Sipadan is capped by a government permit system specifically to protect the reef, which means demand consistently outstrips supply and advance booking through a dive operator is essential. Beyond Sipadan, the wider Semporna archipelago (Mabul, Kapalai, Mataking) offers excellent muck diving - a specialized style focused on unusual small critters in sandy, less pristine-looking terrain - that's arguably as rewarding for underwater photographers as Sipadan's big-animal drama. Most visitors base themselves on a resort island (Mabul is the most common) rather than in Semporna town itself, treating the town purely as a transit and permit-arrangement point.