These three areas covered on this map are genuinely different diving experiences, not interchangeable options — worth understanding before picking a base. Dauin/Zamboanguita is muck diving: black volcanic sand slopes, mostly shore-accessible without a boat, built around finding small, strange, camouflaged critters (frogfish, ghost pipefish, nudibranchs, flamboyant cuttlefish) rather than dramatic scenery — the area hosts 29 of the world’s 33 known frogfish species, notable enough to be featured in BBC’s Planet Earth III. Apo Island is the opposite: a 30-45 minute boat crossing to a protected reef and wall system with healthy hard coral, turtles on nearly every dive, and current-swept drift sites for more advanced divers — reef diving, not muck. Sipalay/Cauayan, on Negros’ west coast, is a separate reef-diving area entirely disconnected from the Dauin/Apo cluster geographically, reached via a different, longer overland route. A diver with limited time who wants variety without much travel should base in Dauin and day-trip to Apo Island — combining both in the same stay is standard practice for operators there. Sipalay is really its own trip rather than an add-on to a Dauin/Apo visit given the distance.