Dive site · sea · The Similan Islands
🇹🇭 Boulder City
Similan Islands, Phang Nga, Thailand
A field of granite blocks on sand south of Island 3, the deepest and most exposed of the southern Similan sites.
- Dives here
- 1
- Deepest
- 24 m
- Water
- salt
- First · last
- 2013
- Position
- 8.5069, 97.6786
Revision 1 · changed 10 Oct 2026
History
- r1 10 Oct 2026 Imported from the personal log · Dennis Bakhuis
Site data © divelog-sites contributors (ODbL), descriptions and maps CC BY-SA 4.0 · 53edcaf
1 map
- Buoy
- Marker
- Pinnacle / rock
- Other object
- Depth contour
- Sand
- Other area
- Depth
Boulder City, three pinnacles of granite boulders on a sand bottom in the southern Similans, with sand gaps of 30-40 m between the pinnacles (Similan Dive Center); the northern pinnacle tops out at about 14 m, the middle one at 12 m and the southern one at 18 m, with sand at 25-30 m and the bottom past 35-40 m (IDC Phuket), and the mooring line is on the west side down to about 18 m. No OpenStreetMap feature exists; the position is estimated 400 m south-east of the end of Shark Fin Reef as the dive guides describe, so it is uncertain. The site coordinates (8.54, 97.64) were 4 km north-west, near Island 4.
Map © divelog-sites contributors, CC BY-SA 4.0 · 53edcaf
Boulder City sits south of Similan Island 3, in the southern group. It is what the name says: a scatter of very large granite blocks standing on a sand bottom, running from about 15 m down past 35 m, with soft coral in the gaps between them and current running through.
Being at the southern, exposed end of the archipelago it gets less traffic than the central islands and more big fish passing.
Dived 23 November 2013 to 24 m, on the first day of the liveaboard.
Dived here with
Nearby sites
1 dive at Boulder City
- 23 Nov 2013 with Kim date23 Nov 2013 depth24 m time47 min water—
Sources
- First-hand observation (Dennis Bakhuis)