Pulau Sangiang & Sunda Strait: Krakatau Volcanic Slopes Dive Site – Pulau Sangiang & Sunda Strait
Site Overview
Pulau Sangiang & Sunda Strait: Krakatau Volcanic Slopes is a remarkable dive site in the Pulau Sangiang & Sunda Strait region, situated where nutrient-rich currents create thriving marine ecosystems that support extraordinary biodiversity throughout the year. The site features pristine coral formations descending from 5m to 30m, with exceptional coral coverage across every depth level. Krakatau offers unique volcanic diving with black sand slopes, sulfur vents, and specialized marine life adapted to volcanic conditions. The site is accessed from Anyer by boat and is best dived from April through November during the dry season when visibility reaches 20 to 30 meters and seas are generally calmest. Pulau Sangiang & Sunda Strait: Krakatau Volcanic Slopes remains one of the less-dived sites in the region, offering pristine conditions and uncrowded experiences that are increasingly rare in popular dive destinations. The coral diversity and fish density at this site consistently impress visiting divers and underwater photographers alike. The underwater landscape is characterized by pristine coral formations that have thrived in the nutrient-rich waters of the Pulau Sangiang & Sunda Strait region for decades, creating a living reef system of remarkable beauty and ecological importance. Divers consistently report that the marine biodiversity encountered here rivals even the most celebrated dive destinations in Indonesia, with healthy coral coverage extending from the shallow reef crest to the deepest sections. The relative isolation of Anyer as a dive hub means that the reefs have experienced minimal dive pressure, preserving their pristine condition for future generations of divers to explore and appreciate.
Dive Briefing
"The dive begins with a descent from the boat onto the reef crest at approximately 5 to 8 meters. Your guide leads you along the reef slope in the direction of the moderate current, descending gradually to 25 to 30 meters. The reef is covered in dense hard and soft corals at every depth, with resident turtles, Napoleon wrasse, and schools of reef fish throughout. The deeper sections feature sandy ledges and overhangs where whitetip reef sharks rest during the day. Throughout the dive, your guide will point out notable marine species and interesting coral formations that you might otherwise miss. The variety of habitats ensures that every minute of the dive offers something new and exciting to discover. Your guide signals the ascent and you work your way back up to the shallower reef at 5 to 8 meters where the coral garden is spectacular in the sunlight. The safety stop is conducted along the upper slope before surfacing near the boat. Total dive time is typically 50 to 60 minutes depending on air consumption and the depth profile chosen."
Signature Marine Life
Grey reef shark
Carcharhinus amblyrhynchos
Barracuda
Sphyraena barracuda
Hawksbill turtle
Eretmochelys imbricata
Napoleon wrasse
Cheilinus undulatus
Eagle ray
Aetobatus narinari
Safety & Hazards
- moderate current along the exposed reef requiring drift diving technique
- Deep sections at 30m requiring strict depth and air monitoring
- Fire coral on the shallow reef flat requiring careful buoyancy during ascent
- Sea urchins on rocky sections and rubble patches throughout the site
- Boat traffic on the surface requiring proper SMB deployment during ascent
Traveler Notes
Who is this for?
Pulau Sangiang & Sunda Strait: Krakatau Volcanic Slopes is an excellent choice for intermediate to advanced divers with Open Water certification and at least 20 logged dives. The moderate current and reef slope profile make the site accessible while still delivering world-class marine encounters. Underwater photographers will appreciate the mix of wide-angle coral scenery and macro critter opportunities found throughout the site. Good buoyancy control is essential to protect the fragile coral formations and to maintain position in the current. The site rewards divers with high biodiversity, healthy coral growth, and regular encounters with large marine species that make every dive memorable and provide outstanding value for the adventurous diver seeking remote Indonesian destinations.
Quick Stats
Dive Logistics
- Sangiang Dive Resort
- Krakatau Dive
Photography Info
Best for: wide_angle, macro
Nearby Stay
Anyer Dive Resort
Anyer • 30km away
Anyer Island Hotel
Anyer • 30km away