Diving atSimon's Reef (Indonesia)
Descending onto Simon's Reef involves a panoramic drop into a thriving underwater landscape. This advanced dive in the Gili Islands reveals a distinct patch reef, its upper reaches starting at 18 m / 60 ft before plunging to a sandy bottom around 35-40 m / 115-130 ft. It's an experience designed for experienced divers, offering a blend of grand topography and intricate macro life against the backdrop of vibrant corals.
Tonight's objective overview for Simon's Reef shows an air temperature of 26.5°C. The measured surface conditions include wave heights around 1.1 m. This environmental data is logged for the close of the day.
Dive Site Location & Key Facts
Everything you need to know about this dive site.
Dive Site Overview
Simon's Reef holds a significant reputation within the Gili Islands dive community for its exceptionally diverse coral structures and deep reef characteristics. Unlike many shallower sites, the reef top here begins at 18 m / 60 ft, making it exclusively suitable for advanced certified divers.
This deep profile allows for the growth of extensive gorgonian sea fans and enormous barrel sponges, creating a visual spectacle not commonly encountered in the region. The site's primary structure is a patch reef, rising dramatically from a sandy seafloor that stretches to 35-40 m / 115-130 ft. This creates a varied topography of sea mounds, intriguing overhangs, and natural sand formations.
Currents can range from mild to very strong, often dictating a drift dive approach, adding to the dynamic nature of the experience. Divers can expect to explore these intricate formations, where both wide-angle enthusiasts find ample subjects in the expansive corals and reef topography, and macro photographers discover tiny wonders hidden within.
Its depth profile also makes it an excellent location for Nitrox users seeking to maximize their bottom time.
Simon's Reef
Conditions are Excellent
Best Dive Window
07:00 - 14:00
Optimal conditions expected
Current conditions near Simon's Reef show 26° air, 29° sea temperature, 0.7 m waves, and 22 km/h wind. Forecast data is refreshed regularly to ensure accuracy.
Best Time to Dive
Optimal diving conditions prevail throughout the entire year at Simon's Reef, with generally high visibility. Water temperatures consistently hover around a comfortable 28°C / 82°F annually. Air temperatures remain steady, averaging 26-27°C / 79-81°F across all seasons. While rain showers occur, particularly between January and March, monthly rainfall typically stays below 14 mm / 0.5 inches, with significantly drier periods from May through October, when rain averages just 1-3 mm / 0.04-0.12 inches. Wave heights are generally manageable, averaging under 1 meter / 3 feet year-round, although wind speeds of 11-16 km/h / 7-10 mph can influence surface chop. The dive score for Simon's Reef consistently rates "Good" (7-8) every month, indicating reliable diving opportunities regardless of the specific time of year.
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
Upon entering the water at Simon's Reef, visibility often reaches 30 m / 100 ft, providing clear views of deep reef structures. A sense of vastness envelops you, with massive sea mounds rising from the sandy depths, sculpted by currents. Drifting along, divers encounter enormous barrel sponges and sprawling gorgonian sea fans, displaying colors from vibrant purple sea whips to bright orange. Currents here vary considerably, from a gentle push to a powerful flow; a dynamic drift dive is common. This constant movement helps keep the reef vibrant, attracting pelagic species. Exploring the topography reveals fascinating overhangs and outcrops, often sheltering schooling fish. An immersive deep reef experience awaits, characterized by impressive scale and continuous underwater motion.
Dive Difficulty & Safety Guidelines
Diving Simon's Reef requires an Advanced Open Water certification due to its depth profile, with the reef top starting at 18 m / 60 ft and extending to a sandy bottom at 35-40 m / 115-130 ft. Currents at this site vary from mild to very strong, necessitating solid buoyancy control and comfort with drift diving techniques. Always maintain awareness of your dive computer and no-decompression limits, especially given the site's average depth; using Nitrox is highly recommended for maximizing bottom time safely. Plan gas management carefully for a deep dive. Consistently reported specific hazards are limited to managing variable currents and depth. A panoramic descent onto the reef requires careful equalization and controlled descent rates. Always dive with a reliable buddy and follow your guide's instructions closely.
Recommended Equipment
Current and surface separation risk. Local briefing strongly recommended.
- Dive Computer
- DSMB
- Reel / Spool
This gear list is based on verified equipment signals for Simon's Reef, Indonesia. Always confirm final gear choices with your dive operator, guide, or liveaboard.
Recommended Dive Suit
Repeated dives during the same day can gradually reduce overall body warmth.
The water around Simon's Reef is currently holding at approximately 29°C (84°F), setting the tone for today's dives. Surface air temperatures are resting at 26°C (79°F). Divers spending extended time underwater often rely on dive skin or rash guard for balanced warmth and flexibility.
The upcoming forecast points to generally steady conditions in the area.
Due to technical issues with our weather providers, data hasn't been fetched for over 48 hours. The data above reflects the conditions at the time of the last successful fetch.
Emergency & Medical Support
Essential information to help you plan your dive trip to Simon's Reef.
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 Simon's Reef
Approaching Simon's Reef, the sheer abundance of massive coral structures immediately captures attention, including impressive gorgonian sea fans and colossal barrel sponges. Schools of blue and yellow fusiliers cascade over the reef, while larger pelagics like trevallies, barracudas, and tuna are frequently sighted cruising the deeper sections. Keep an eye out for resident green sea turtles and the occasional white tip reef shark. For those with a keen eye, the intricate reefscape reveals smaller wonders: garden eels swaying from the sandy patches, blue spotted stingrays resting, and cuttlefish subtly camouflaged. Intrepid macro photographers might even discover pygmy sea horses, porcelain crabs, hairy squat lobsters, and a diverse array of vibrant nudibranchs amongst the corals.
Dive Sites Near Simon's Reef
View all dive sites in IndonesiaDiscover more underwater gems in this area.
Dive Centers Near Simon's Reef
Working Hours
Today: 07:00 - 18:00
3W Dive Center
Gili Scuba Diving
DSM Dive Center
Indonesia Scuba Diver
Tulamben Scuba Dive Center
Abyss Dive Center
Amed White Sand Divers
Nearest Airports
Nearest airports to help plan travel to this dive area.
Search Flights
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Search Flights on ExpediaFrequently Asked Questions
What diver certification level is required for Simon's Reef?
Simon's Reef is an advanced dive site. Divers must hold an Advanced Open Water certification or be undertaking the Advanced Adventurer Course under direct supervision.
What are the typical depths at Simon's Reef?
The reef top begins at 18 m / 60 ft, descending to a sandy bottom around 35-40 m / 115-130 ft. It is classified as a deep dive.
How are the currents at this dive site?
Currents at Simon's Reef can vary from mild to very strong. Divers should be comfortable with drift diving techniques and maintain excellent buoyancy control.
What kind of marine life might I see at Simon's Reef?
Expect to encounter spotted eagle rays, green sea turtles, and white tip reef sharks. The reef also hosts schools of fusiliers, barracudas, tuna, garden eels, and various macro life like pygmy sea horses and nudibranchs.
Is Nitrox recommended for diving Simon's Reef?
Yes, Nitrox is highly recommended. Given the site's average depth and deep profile, using Nitrox significantly increases your available bottom time safely.
Can I dive Simon's Reef all year long?
Yes, Simon's Reef is diveable throughout the entire year. Water temperatures remain stable around 28°C / 82°F, and dive scores are consistently good.
What is the typical visibility at Simon's Reef?
Visibility at Simon's Reef is generally excellent, often reaching up to 30 m / 100 ft. This allows for clear views of the extensive reef structures and marine life.
How long is the boat ride to Simon's Reef?
Travel time to Simon's Reef from local dive centers in the Gili Islands is typically around 15-20 minutes by boat.
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Simon's Reef
Conditions are Excellent
Best Dive Window
07:00 - 14:00
Optimal conditions expected
Current conditions near Simon's Reef show 26° air, 29° sea temperature, 0.7 m waves, and 22 km/h wind. Forecast data is refreshed regularly to ensure accuracy.