Just off the southwest tip of Botum Sakor National Park, the Koh Sdach Archipelago (ប្រជុំកោះស្ដេច) is a modest grouping of 12 small islands, most of them uninhabited. Basing yourself at one of the two islands with accommodation – Koh Sdach (King Island) or Koh Totang – you can spend a day or two exploring the other islands, some of which have utterly isolated beaches and good snorkelling and scuba diving. Koh Sdach has 24-hour electricity.
The area has changed markedly as a huge Chinese 'resort city' has taken over the nearby mainland, once known for pristine beaches backed by virgin forest. Years in the making, the project includes an 18-hole golf course, though much of the plan had yet to unfold during our last visit.
Fortunately, the islands appear to be largely excluded from the development, and existing accommodations are far enough from the mainland that the commotion is out of earshot and eyesight.