

Best for advanced divers, 12-40m, boat entry, strong current.
Boulder City is defined by massive granite boulders that stack and tumble to 40 metres, creating a landscape of swim-throughs, overhangs, and crevices. Located 1000 metres from shore, this site requires boat access and is suited for advanced divers due to strong currents. Visibility typically ranges from 15 to 30 metres. Water temperatures are generally 27 to 30C, though cold water masses can occasionally drop temperatures to 21 to 25C. Hazards include strong currents, deep water, and potential encounters with stonefish, lionfish, and sea urchins. Divers should maintain neutral buoyancy and avoid contact with rock surfaces. Night diving is permitted at this location.
8.50985, 97.67032
Time your dive around slack water if possible, as the currents at Boulder City can run hard enough to pin you against the rock faces and burn through your air supply fast. Brief with your guide on the current direction before descending, and agree on a bail-out plan if conditions shift mid-dive.
Most commonly visited by liveaboard vessels operating throughout the Similan Islands.
Recorded at this site
Depth
12-40m
Visibility
15-30m
Skill Level
Advanced
Entry
Boat
Boat required
Water Temp
27-30°C
Current
Strong
Typical Dive
60 min
The site ranges from 12 to 40 metres, with an average depth of 25 metres.
No, this site is intended for advanced divers due to the strong currents and depth.
Boulder City is located 1000 metres from shore and requires boat access.
Hazards include strong currents, deep water, entanglement risks, and the presence of stonefish, lionfish, sea urchins, and sharp coral.
This site is designated for diving and is generally not suitable for snorkelling due to the depth and strong currents.
Diving at Boulder City in Khao Lak requires the following certifications: Open Water. Always dive within your training limits.
Yes, equipment rental is available at or near Boulder City in Khao Lak. Contact local dive operators for specific gear availability and prices.
A rashguard or 2mm shorty is recommended for diving at Boulder City in Khao Lak. Water temperatures range from 27°C to 30°C.
Boulder City in Khao Lak can have strong currents. Advanced experience with drift diving and current navigation is recommended.
Visibility at Boulder City in Khao Lak typically ranges from 15 metres to 30 metres. Conditions vary with weather, tides, and seasons.