Dive Site: Southwest Pinnacle

About Southwest Pinnacle

Southwest Pinnacle, located approximately 45 minutes by boat from Koh Tao's Mae Haad pier, is a renowned dive site in the Gulf of Thailand. This cluster of granite pinnacles offers a spectacular underwater landscape, with the main pinnacle rising to 7 meters below the surface and the surrounding structures descending to 30 meters. Unlike some open-water sites, its configuration provides a more sheltered environment, yet it remains a pelagic hotspot during migration seasons. The site is celebrated for its incredibly dense anemone fields that blanket the pinnacles, creating a riot of color from top to bottom. These anemones host numerous clownfish, making for captivating photographic opportunities. Beyond the anemones, the site supports a rich ecosystem, from macro life such as nudibranchs and cleaner shrimps in crevices to larger marine species like giant groupers patrolling the walls and schools of barracuda in the mid-water. Water temperatures consistently range from 27-30°C year-round, ensuring comfortable diving. While currents can be moderate and variable, the site is generally accessible. It offers something for all certification levels, with shallower sections perfect for Open Water divers and deeper areas providing exploration for Advanced Open Water divers. Its unique combination of vibrant reef life and pelagic potential makes it a standout dive in the region.

Dive site facts: Southwest Pinnacle

Depth

7–30 m

Typical dive

15–25 m, 50 min

Current

Moderate, variable

Visibility

15–25 m

Water temperature

27–30 °C

Entry

Boat

Level

Open Water minimum, AOWD recommended for full exploration

Dive type

Pinnacle, reef, pelagic encounters

Night dive

Possible

Region / port

Koh Tao, Gulf of Thailand

Coordinates

10.0234, 99.7789

Conditions & Currents

Currents at Southwest Pinnacle are typically moderate and variable, influenced by seasonal monsoon patterns. During the peak diving season from February to May, currents are generally mild, contributing to excellent visibility and comfortable diving conditions. However, divers should be prepared for stronger currents during other times of the year, particularly during the northeast monsoon (December-January) which can bring choppier seas and increased surge. Experienced divers will find the site manageable even with stronger currents, but all divers should pay close attention to dive briefings regarding current direction and entry/exit procedures. Negative entries may be necessary on some occasions to reach the main pinnacle quickly.

Marine life & sighting chances

Anemone fish

common

Anemone

common

Giant grouper

common

Barracuda

common

Moray eel

common

Nudibranch

common

Cleaner shrimp

common

Whale shark

March - May · occasional

Parrotfish

common

Butterflyfish

common

Angelfish

common

Dive profile & how the dive runs

Your dive at Southwest Pinnacle typically begins with a boat entry, often a negative entry depending on currents, to quickly descend to the main pinnacle. You will start by exploring the shallower sections, around 7-10 meters, which are carpeted with vibrant anemone fields teeming with clownfish. From there, you'll progressively move deeper along the pinnacle walls, descending to 15-25 meters, where you can observe giant groupers and various reef fish. Macro enthusiasts can scan crevices for nudibranchs and moray eels. Depending on current conditions, the dive may be a drift along the cluster of pinnacles, allowing you to cover more ground and look out into the blue for schools of barracuda or potential whale shark sightings. The turn point is typically dictated by air consumption or depth limits, before gradually ascending for your safety stop in the shallower, current-protected areas of the pinnacle.

Underwater photography

Southwest Pinnacle is a dream for underwater photographers, particularly for wide-angle and macro shots. The expansive anemone fields with their resident clownfish are perfect wide-angle subjects, especially when lit by natural light from above. Consider a wide-angle lens for capturing the scale and color of these fields and the entire pinnacle structure. For macro photography, numerous nudibranchs, cleaner shrimps, and moray eels can be found tucked into the crevices and under ledges. Utilize external strobes to bring out the true colors of the anemones and the intricate details of smaller subjects. Buoyancy control is paramount to avoid disturbing the delicate anemones and corals. Be patient when photographing clownfish, allowing them to become comfortable with your presence for natural, engaging shots. The potential for pelagic encounters also means having a general-purpose or wide-angle setup ready for quick changes.

Combine with nearby dive sites

• Chumphon Pinnacle

  Iconic deep site with high whale shark potential.

• Sail Rock

  Famous for its 'Chimney' swim-through and pelagic encounters.

• Koh Tao — Twins

  Popular site with varied topography and abundant reef fish.

• Koh Tao — Japanese Garden

  Shallow coral gardens ideal for beginners and snorkelers.

• HTMS Sattakut Wreck

  Purpose-sunk wreck attracting diverse marine life.

Getting there & logistics

Diving Southwest Pinnacle is typically organized through dive operators based in Koh Tao, Thailand. The island is accessible via ferry from various mainland ports like Chumphon and Surat Thani, which are served by domestic flights from Bangkok (Don Mueang or Suvarnabhumi Airport). Liveaboard options are less common for Koh Tao-specific itineraries, as most diving is day-trip based. Trips to Southwest Pinnacle usually depart from Mae Haad pier and involve a 45-minute boat ride. Park fees are generally not applicable for this site, but dive packages vary. Divers often combine this site with other Koh Tao pinnacles like Chumphon Pinnacle or sites offering different marine life and topography, fitting into multi-day dive packages or Advanced Open Water courses.

Safety & environment

While Southwest Pinnacle is generally considered safe, standard diving safety precautions are essential. The nearest recompression chamber is located in Koh Samui, necessitating proper planning for evacuation in case of a dive emergency. It is highly recommended to have comprehensive dive insurance covering medical evacuation and treatment. Site-specific hazards include variable currents, which can necessitate careful buoyancy control and awareness of your dive guide's instructions, especially for negative entries or drift dives. Always maintain proper hydration and avoid aggressive interactions with marine life, particularly titan triggerfish, which can be territorial during nesting season. Adhere strictly to depth and no-decompression limits, and ensure your dive computer is always monitored. Listen carefully to the dive briefing for specific current conditions and emergency procedures on the day of your dive.

Who it suits — and who it doesn't

FAQ

Southwest Pinnacle FAQ

Liveaboards diving Southwest Pinnacle

These liveaboards may visit Southwest Pinnacle on selected itineraries — the exact dive sites depend on departure, weather and conditions.

Mandarin Queen 9

Thailand

26 guests37.5 m

Manta Queen 8

Thailand

24 guests

$127/day

The Junk

Thailand

18 guests33 m

$163/day

Deep Andaman Queen

Thailand

23 guests30.5 m

$194/day

Explorer

Thailand

16 guests25 m

$150/day

Andaman

Thailand

20 guests26 m

$108/day

Stingray

Thailand

8 guests24 m

$245/day

Seatopia

Thailand

24 guests24 m