Ransiwor

Ransiwor is a reef dive site in Raja Ampat, West Papua, Indonesia.

Overview

Ransiwor is a reef site located in the southern reaches of Raja Ampat’s main island cluster, in an area known for its intact and rich coral ecosystems. The name likely derives from a local place name from the indigenous Papuan language of the region. The site features a sloping reef that descends from shallow coral gardens, characterised by high hard coral coverage that remains in excellent condition under the protection of Raja Ampat’s marine protected area framework. Currents flowing across the reef maintain water quality and bring nutrients that sustain the dense fish populations Raja Ampat is known for. Visibility averages 20-30 meters and water temperatures remain 27-29°C year-round.

Site Information

• Location: Raja Ampat, West Papua, Indonesia
• Entry Type: Boat dive
• Site Type: Reef
• Difficulty Level: Intermediate
• Maximum Depth: 25 meters
• Typical Visibility: 15-30 meters
• Current: Moderate, variable
• Best Time: October to April

Marine Life

Hard coral gardens in the shallows at Ransiwor support extensive clownfish communities in carpet anemones. Parrotfish, surgeonfish, and wrasse in large numbers feed across the reef surface. Reef sharks are a regular presence at the reef edge, and Napoleon wrasse patrol the mid-water. Hawksbill turtles graze on sponges along the slope. In the deeper rubble zone, look for ornate ghost pipefish, frogfish, and various species of flathead. Large schools of anthias over the reef crest are a visual highlight.

Dive Profile

Enter near the reef crest (5-8 meters) and explore the shallow coral gardens before descending the slope to around 20-25 meters. The richest coral cover is in the 8-18 meter range. Follow the slope in one direction before ascending gradually back to the reef top for the safety stop. The dive offers approximately 45-60 minutes of bottom time at these depths with standard recreational equipment.

Entry and Exit

Access is by dive boat from local homestay or liveaboard operators. Entry via giant stride from the boat. The site is typically dived from the southwest, with currents running along the reef slope. Deploy SMB at 5 meters for boat pickup.

Tips and Recommendations

• Spend extra time in the shallow coral gardens — the diversity and health of the hard corals is exceptional
• Check the rubble zone at depth for cryptic species like frogfish and ghost pipefish
• Early morning light through the shallow water illuminates the coral colours beautifully
• Carry a torch even for daytime dives to reveal true colours in the mid-range depths
• This is a good site for both fish diversity and coral photography

Safety Considerations

Variable currents may develop during the dive — stay close to your guide and use the reef for shelter if needed. Carry an SMB and ascend at a controlled rate. Always dive within your certification level. The reef surface can be sharp — maintain buoyancy to avoid contact.

Photography

The healthy hard coral gardens at Ransiwor make for outstanding wide-angle coral scenics, particularly with good ambient light in the morning. Shooting upward through the coral in the shallows with dappled light above is a reliable composition. Macro opportunities in the rubble at depth include frogfish, ghost pipefish, and nudibranchs that reward patient photographers.

Sources: Papua Diving - Raja Ampat Dive Sites, Bluewater Dive Travel - Raja Ampat Diving, La Galigo Liveaboard - Top 10 Raja Ampat Dive Sites, Girls That Scuba - Scuba Diving Raja Ampat, PADI - Diving in Raja Ampat. Last updated 2026-04-04.