Borneo

Borneo gets pitched as a single destination but it's really two - Malaysian Borneo (Sabah and Sarawak) and Indonesian Kalimantan - plus tiny, oil-rich Brunei wedged between them. Almost every client I've booked here has gone to the Malaysian side, because it has the infrastructure: direct flights into Kota Kinabalu or Kuching, established eco-lodges, and rivers with a long history of wildlife tourism. Kalimantan is wilder and cheaper but asks a lot more of the traveller in transit time and flexibility, so I only route people there when they've already done a first Borneo trip and want to go further off the map.

The wildlife draw is real but it isn't a safari - sightings on the Kinabatangan River or in the Danum Valley come from slow boat drifts at dawn and dusk and patient guides who know which fig tree is fruiting, not from vehicles chasing animals across open plains. Orangutans are the headline species, but the semi-wild rehabilitation centres (Sepilok, Semenggoh) guarantee a sighting far more reliably than the truly wild river stretches do, and I usually book both so a client isn't relying on luck alone.

Climate is equatorial and doesn't really have a dry season the way mainland Southeast Asia does - it's warm and humid year-round with rain most afternoons. What changes seasonally is river level and diving visibility: rivers can flood the lodge boardwalks after heavy rain in the wetter months, and Sipadan's visibility off Sabah's east coast is best from April to December, worse in the January–March monsoon swell.