Alor: Half Moon Bay Dive Site – Alor Archipelago
Site Overview
Alor: Half Moon Bay is a remarkable dive site in the Alor-Pantar strait, situated where the powerful convergence of the Flores Sea and Banda Sea creates nutrient-rich upwellings that sustain extraordinary marine biodiversity. Half Moon Bay is a sheltered crescent-shaped reef on the southern side of the Alor-Pantar strait, offering a more relaxed dive profile with moderate current and excellent coral coverage. The site is particularly known for its resident hawksbill turtles and the mandarin fish that emerge at dusk on the shallow rubble patches. The site is accessed from Kalabahi by boat, typically 35 to 50 minutes depending on the specific location. The coral coverage is exceptional, with dense hard and soft corals covering every available surface from the shallows to the deeper sections. Resident marine species include turtles, Napoleon wrasse, and a variety of reef sharks, while visiting pelagics such as eagle rays, barracuda, and giant trevally add excitement to every dive. The Alor archipelago remains one of Indonesia's most remote and least-dived destinations, with underwater conditions that rival the more famous Raja Ampat and Komodo regions. The best diving conditions are from April through November during the dry season, when visibility reaches 25 to 30 meters and the seas are calmest.
Dive Briefing
"The dive begins with a descent from the boat onto the reef crest at approximately 5 meters. Descend onto the shallow coral garden at 3 to 5 meters and follow the gentle slope down to 15 to 20 meters. Hawksbill turtles are frequently seen foraging on the reef. At 20 to 25 meters, sandy patches host colonies of garden eels. The shallower sections at 5 to 10 meters feature dense coral formations and abundant reef fish. Your guide monitors the current throughout the dive and adjusts the route accordingly. The coral diversity at every depth level is outstanding, from massive table corals and staghorn formations in the shallows to dense soft corals and gorgonian fans on the deeper walls. The safety stop is conducted at 5 meters along the upper reef before returning to the boat. Total dive time is typically 50 to 60 minutes depending on air consumption and depth profile."
Signature Marine Life
Hawksbill turtle
Eretmochelys imbricata
Best: April, May, June
Whitetip reef shark
Triaenodon obesus
Mandarin fish
Synchiropus splendidus
Best: May, June, July
Garden eel
Heteroconger hassi
Napoleon wrasse
Cheilinus undulatus
Safety & Hazards
- Moderate to strong current requiring drift diving techniques
- Deep profile sections requiring strict depth and air management
- Fire coral on the shallow reef flat requiring careful buoyancy
- Sea urchins on rocky sections and rubble patches
- Boat traffic on the surface in the active Alor-Pantar strait
Traveler Notes
Who is this for?
Half Moon Bay is ideal for intermediate divers seeking a more relaxed Alor diving experience with excellent turtle encounters and beautiful coral scenery. The moderate current and gentle slope profile make it suitable for divers with Advanced Open Water certification and at least 20 logged dives. The site also appeals to underwater photographers who appreciate the mix of wide-angle coral scenery and macro critter opportunities found throughout the reef. Good buoyancy control is essential to avoid damaging the fragile coral formations, particularly on the shallower sections where table corals and staghorn formations create a stunning underwater landscape. The relaxed pace of the dive allows photographers to set up their shots carefully.
Quick Stats
Dive Logistics
- Alor Divers Resort
- Alor Dive Center
- Coral Triangle Divers
Photography Info
Best for: wide_angle, macro
Nearby Stay
Kalabahi Dive Resort
Kalabahi • 40km away
Kalabahi Island Hotel
Kalabahi • 40km away