Diving at Atlantis (Cambodia)
Atlantis, located off Koh Tang in Cambodia, draws its name from a large, sprawling reef structure often compared to a sunken city. This remote site, about 4-5 hours from the mainland, is part of an exclusive diving destination south-west of Koh Rong Saloem. Its nomenclature reflects the sense of discovery and the extensive coral formations awaiting exploration by divers venturing into these clear waters. The site unfolds over an expansive bay, inviting deeper investigation.
Tonight's objective overview for Atlantis shows an air temperature of 29°C. The measured surface conditions include wave heights around 0.3 m. This environmental data is logged for the close of the day.
Dive Site Location & Key Facts
Dive Site Overview
Exploring Atlantis reveals a substantial reef system, gently sloping from its shallower sections into the wider expanse of the bay. Initial dives in the upper reef reveal numerous coral bommies dotting the seascape, typically reaching down to about 12 meters.
These vibrant structures provide abundant shelter, creating focal points for observations of angelfish, spotted sweetlips, and groupers. As divers progress deeper, towards a maximum depth of around 16 m (52 ft), the terrain gradually transitions. Deeper zones see the reef increasingly dominated by expansive fields of staghorn coral, interspersed with occasional sandy patches.
The sheer density and scale of these formations contribute to a sense of diving through an underwater garden. Whip coral and fan coral are also notable, particularly in the deeper parts, often creating an ethereal atmosphere.
Visibility generally ranges from 10-30 m (33-100 ft), with averages near 15 meters. Divers access this extensive reef, characterized by varied coral topography, via boat entry.
Conditions are Moderate
Optimal conditions expected
Current conditions near Atlantis show 29° air, 30° sea temperature, 0.3 m waves, and 36 km/h wind. Forecast data is refreshed regularly to ensure accuracy.
Best Time to Dive
Optimal visibility often defines the best times for diving Atlantis, and this typically aligns with Cambodia's dry season. Conditions are rated "Excellent" for diving from December through April. During these months, average air temperatures comfortably range from 27.5°C to 29°C (82-84°F), contributing to pleasant surface intervals. Rainfall is minimal, with monthly averages often below 3 mm (0.12 inches), which generally translates to clearer waters. Wave heights also tend to be lower, typically between 0.3 to 0.4 m (1.0-1.3 ft), leading to calmer boat rides and easier entries. As the year progresses into May, conditions remain "Good," but rainfall begins to increase, peaking from July to September with averages reaching up to 16.8 mm (0.66 inches). While diving is still possible, the higher rain and wave heights, sometimes reaching 0.7 m (2.3 ft), might affect visibility and comfort. For the clearest conditions and most comfortable experience, planning a trip during the dry season offers the most reliable choice.
PEAK SEASON SCORE
Scores combine air & water temps, waves, wind & rainfall for overall conditions.
BEST MONTHS TO DIVE
Monthly records compiled from satellite and marine observation nodes over the last 3 years. Data provided by Open-Meteo and MET Norway.
Dive Experience & Conditions
Descending into Atlantis, divers initially encounter vibrant, shallower sections of the reef, starting near the surface. Transitioning from the open ocean via boat entry places you directly into an environment brimming with structure. Upper reef areas, typically down to 12 meters, present a landscape of coral bommies demanding closer inspection. Further into the descent, reaching deeper sections, topography shifts to extensive staghorn coral fields. Presence of whip and fan corals here adds to the visual tapestry. Water temperatures are consistently warm; specific readings aren't always reported for this exact site, but regional tropical waters maintain comfortable conditions year-round. Visibility around Koh Tang is notably good, averaging around 15 meters, with potential for up to 30 meters on exceptional days. Current can vary, but this site is generally approachable, allowing for relaxed exploration of its expansive coral reef.
Dive Difficulty & Safety Guidelines
Safety at Atlantis primarily revolves around standard dive practices, as specific hazards are not consistently reported for the site itself. Given its boat entry, ensuring proper surface protocols, including the use of a Surface Marker Buoy (SMB), is crucial for visibility to surface vessels.
Divers should always plan their dive within recreational limits, not exceeding the maximum depth to avoid decompression sickness. Maintaining good buoyancy control is essential to protect the delicate coral formations, particularly the extensive staghorn corals and bommies.
While visibility is generally good, conditions can change, so remaining aware of your buddy and surroundings is important. It's advisable to dive with experienced local operators familiar with the nuances of Koh Tang's dive sites, as they provide current information and support for a safe diving experience.
Recommended Equipment
- Dive Computer
This gear list is based on verified equipment signals for Atlantis, Cambodia. Always confirm final gear choices with your dive operator, guide, or liveaboard.
Recommended Dive Suit
Water temperatures at Atlantis are currently estimated to be around 30°C (86°F), shaping the overall diving conditions for today. Surface air temperatures are resting at 29°C (84°F).
Many divers choose dive skin or rash guard when diving in similar conditions.
Forecast models show minimal temperature variation in the coming days.
Emergency & Medical Support
Essential information to help you plan your dive trip to Atlantis.
Hyperbaric chambers are a critical part of dive safety infrastructure. Availability varies significantly by region, and not all dive areas have immediate access.
Before diving, it's recommended to:
- confirm nearest medical facilities
- check emergency procedures with local dive operators
- ensure dive insurance covers evacuation if required
Divers Alert Network
Diving emergency assistance available through DAN World.
+1-919-684-9111- 24/7 emergency hotline
- Diving medical assistance
- Evacuation coordination
Emergency contacts are provided for reference. Always verify local emergency services before diving.
Marine Life at Atlantis
Upon first entering Atlantis, divers often notice the abundance of angelfish and spotted sweetlips sheltering within the numerous coral bommies. Further along the reef, particularly within the vast staghorn coral fields, vivid smaller fish dart between the branches.
Keep an eye out for resident groupers, commonly found near the reef structures. Rays are also known to frequent the site, gracefully moving across the sandy patches or near the reef edges.
While not exclusive to Atlantis, surrounding Koh Tang sites frequently report sightings of marine worms, nudibranchs, and various box and puffer fish, suggesting similar encounters are likely here. Occasionally, schooling trevally and barracuda are observed in the surrounding waters.
Dive Sites Near Atlantis
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Dive Centers Near Atlantis
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Nearest Airports
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Search Flights on ExpediaFrequently Asked Questions
What is the maximum depth at Atlantis?
Atlantis reaches a maximum depth of around 16 meters (52 ft), making it suitable for Open Water certified divers. Its reef gradually descends, allowing for exploration across varying depths.
What type of marine life can I expect to see?
Divers often encounter angelfish, spotted sweetlips, groupers, and numerous vivid smaller fish. Rays are also a common sight, and the coral structures may host nudibranchs and various crustaceans.
What are the typical water conditions?
Water temperatures are consistently warm throughout the year. Visibility generally ranges from 10-30 m (33-100 ft), with an average around 15 meters, making for clear diving conditions.
How do I get to Atlantis?
Atlantis is located off Koh Tang, which is about 4-5 hours by boat from the mainland near Sihanoukville. Dive trips to Koh Tang are typically arranged through local dive operators.
Is Atlantis suitable for beginner divers?
Yes, with its maximum depth remaining within recreational limits, Atlantis is well within the limits for PADI Open Water certified divers. The generally calm conditions and clear visibility make it an accessible site.
Are there strong currents at Atlantis?
While conditions can vary, Atlantis is generally not known for strong currents. Some sites around Koh Tang can have drift dives, but Atlantis usually allows for relaxed reef exploration.
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Conditions are Moderate
Optimal conditions expected
Current conditions near Atlantis show 29° air, 30° sea temperature, 0.3 m waves, and 36 km/h wind. Forecast data is refreshed regularly to ensure accuracy.