North Twin

Granite terrain rather than limestone, with deep boulder slopes. Divers recorded 5–10 Ranong guitarfish resting at 25–30m here in the 2019/2020 season and again in December 2023. Manta sightings are far fewer than at Black Rock, partly because research and dive effort concentrated there.

Depth

3–40m

Current

Strong

Diver level

Advanced open water

Entry

Boat

Unique features

  • Tree-covered granite boulder island; part of the Black Rock & the Twins Important Shark and Ray Area
  • The backup manta site when Black Rock is blank, and one of only two places Ranong guitarfish have been recorded by divers
  • Boulder swim-throughs, eagle rays, hawksbill turtles and leopard sharks on the sand

Sources & last checked

Checked August 2026

This is a researched draft, not yet human-verified. The seasonality and logistics are drawn from the sources below — confirm specifics (permits, fees, closures) with an operator before you book.

Note on the data: Coordinates are approximate; not surveyed dive-site GPS.