About this spot
Batu Bolong is a single seamount rising from deep water between Komodo and Sumbawa, and the geometry of the site is the point: strong currents converge on the pinnacle from multiple directions, compressing nutrients upward and concentrating fish life in densities that are rare even in this region. Divers work the shallower crown at 5–10 m when current is manageable, then drop to 30 m along the walls where the flow is most intense. Visibility averages 25 m, though surge and upwellings can shift conditions quickly. Water temperature ranges 24–29 °C depending on season and current direction. Blacktip reef sharks patrol the upper structure routinely, and great barracuda hold station in the current mid-water. Hawksbill turtles graze the coral-encrusted walls, and honeycomb morays occupy crevices throughout the pinnacle. The site demands solid buoyancy control and comfort in strong, variable current — drift diving experience is essential. April through October offers the most reliable conditions, with the dry season months of July and August typically bringing the strongest currents and best visibility.
📖 Guide: Diving in Indonesia: 323 Sites, Mantas to Micro-critters
Best months
Marine life
Dive types
Trip essentials
Everything you need before you pack — checklist, sun, logistics.
Trip checklist
- 🛂 Visa-free or visa-on-arrival
- 🤿 Pack: 3/2 mm shorty
- 📜 C-card + dive insurance (DAN)
- 📔 Dive logbook
- 🧴 Reef-safe sunscreen SPF 50+
- 🔌 Plug type C/F · 230V adapter
- 💊 Seasickness meds + ear drops
- 📱 Offline maps + emergency contact
Quick facts
- 🌓 Moon First quarter · 47%
- 🤿 Wetsuit 3/2 mm shorty
- GPS
› Sustainability disclosures
From your departure country
- Visa: Visa on arrival · 30 days max
- Flight: 12h · direct
- Jet-lag: 12h east · 8 days recovery
FAQ
›Currents?
Strong — divemaster chooses the sheltered side based on tide. Drift dives only when conditions allow.
›Manta odds?
Mantas are at nearby Karang Makassar, not Batu Bolong specifically. Many operators combine the two.
