Diving atIto (Japan)
Ito, Japan, offers a distinctive underwater landscape, prominently featuring "Shark City," an accessible dive area just minutes from the port. Divers are drawn into close proximity with one of Japan's most dynamic marine spectacles: dense aggregations of Japanese banded houndsharks. It functions as a primary focus for those seeking exceptional shark encounters within a well-established dive environment.
Tonight's objective overview for Ito shows an air temperature of 14.5°C. The measured surface conditions include wave heights around 1.24m. This environmental data is logged for the close of the day.
Dive Site Coordinates
34.9546, 139.7687
Dive Site Characteristics
Key Dive Site Facts
Dive Site Overview
Diving at Ito delivers an immersive experience into a bustling underwater community, largely defined by its remarkable shark populations. Just a quick 1-2 minute boat ride from the port brings divers to "Shark City," found near the Eastern Buoy of "Okimae-ne." A major draw here is the year-round gathering of 200-300 Japanese banded houndsharks, creating a truly dynamic spectacle.
It's a busy environment; these sharks, originally lured away from local fishing nets through conservation efforts, now congregate as a focal point for divers. Beyond impressive shark aggregations, divers also observe Red stingrays cruising along the bottom, with Longtooth groupers and Asian sheepshead wrasse appearing. Witnessing this provides a firsthand look at a successful conservation story, transforming a local challenge into a globally recognized diving attraction.
Tour activities typically involve two boat dives, emphasizing readiness with gear when boarding. For Tokyo-based divers, free transport services are often available for a full-day trip, making it an ideal, albeit advanced, day excursion. Post-dive, nearby "SUSHI town, TATEYAMA" offers fresh seafood, rounding out the day.
Best Time to Dive
Considering the average climate data, the summer months, particularly July, stand out as an optimal period for diving in Ito. July reports a "Good" dive score, with air temperatures averaging around 26.5°C / 80°F, and relatively low rain averages of 2.34 mm. While specific water temperature data isn't consistently reported, these warmer air conditions generally correspond with more comfortable diving temperatures. Dive scores remain "Moderate" through spring, early summer (May-June), and autumn (September-November), with air temperatures ranging from 18.8°C / 66°F in May to 20.5°C / 69°F in October. March tends to have a "Poor" dive score, often experiencing higher wave heights and an average of 6.59 mm of rain. Year-round, wave heights can reach an average of 1.5 to 1.9 meters / 5 to 6.2 feet, indicating that sea conditions vary and can influence tour schedules. Planning for July often provides the calmest waters and most pleasant surface conditions.
Climate Historical Averages
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
Diving at Ito revolves around a vibrant reef structure and sandy bottoms, offering depths that cater to certified advanced divers. Characterized by the dynamic presence of numerous Japanese banded houndsharks, they congregate at the "Shark City" under the Eastern Buoy of "Okimae-ne." Divers can typically expect to explore depths reaching around 20-30 m / 65-100 ft, where major activity unfolds. While specific water temperature data is limited, conditions generally range from cooler in winter to warmer in summer, reflecting regional climate patterns. Visibility can vary, but clear conditions often prevail, allowing for excellent viewing of shark aggregations and other marine life. Currents are not consistently reported but can influence drift over sandy areas. A boat diving location, divers should be geared up and ready to enter the water shortly after departing the dock, often within minutes.
Dive Difficulty & Safety Guidelines
To dive Ito, divers must hold at least an Advanced Open Water certification, reflecting the site's unique characteristics and the need for competent handling of conditions. A strict requirement is that your last dive must have occurred within one year, ensuring recent experience. Tour operators emphasize punctuality for meeting times; late arrivals cannot be accommodated due to boat schedules. After completing multiple dives, a minimum 18-hour surface interval is mandatory before taking any flights. Tour schedules can also change based on sea conditions, so flexibility is advised. These guidelines are in place to ensure a safe and organized experience for all participants.
Recommended Equipment
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Verified equipment recommendations for this dive site are being reviewed and may be added as additional source checks are completed.
Recommended Dive Suit
Forecast conditions over the next few days suggest temperatures will remain relatively stable.
Two divers in the same water temperature may experience very different comfort levels. Stronger winds may also make surface intervals feel cooler than usual. Surface intervals may feel noticeably cooler once you exit the water.
Many divers find that 5mm wetsuit offers the right level of insulation for conditions like these. Consider warmer surface protection (like a boat coat) due to brisk winds. A thermal robe or jacket is recommended between dives. The surrounding waters at Ito are currently registering temperatures of roughly 20°C (67°F). Surface air temperatures are resting at 15°C (58°F).
Conditions last reviewed: 18:00 using the latest environmental data.
Dive Logistics & Preparation
Hyperbaric Chamber
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Entry Requirements
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Currency
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Nearest Airports
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Marine Life at Ito
Ito's underwater environment truly shines through its marine inhabitants, dominated by the remarkable presence of Japanese banded houndsharks. Divers often encounter swarms of 200-300 individuals, a consistent sight year-round at the designated "Shark City." Cruising the sandy bottoms, you'll likely spot Red stingrays, their graceful movements adding another layer to the diverse ecosystem. Rocky structures and reef areas also host Longtooth groupers and the distinctive Asian sheepshead wrasse, making for engaging observations amidst the shark spectacle.
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Frequently Asked Questions
What certification level is required for diving in Ito?
Divers planning to visit Ito must possess at least an Advanced Open Water certification. This requirement ensures that participants have the necessary skills and experience for the specific conditions and marine life encounters at this site.
How close is the dive site to the port?
The primary dive site, known as "Shark City," is exceptionally close to the port. It's typically only a 1-2 minute boat ride, minimizing travel time and maximizing underwater exploration.
What is the main marine life attraction at Ito?
Ito is primarily known for its impressive aggregations of Japanese banded houndsharks. Divers regularly encounter hundreds of these sharks, along with Red stingrays, Longtooth groupers, and Asian sheepshead wrasse.
Are there transportation options from Tokyo?
Yes, many tour operators offer free transportation services from central Tokyo pick-up points such as Ikebukuro, Shinjuku, and Shibuya. This makes Ito a convenient day trip destination for divers.
What is the policy regarding recent diving experience?
Divers are required to have completed their last dive within one year of their planned trip to Ito. This guideline ensures that all participants maintain current diving proficiency and comfort.
Can dive schedules change?
Yes, tour schedules are subject to change based on sea conditions and boat availability. Operators recommend flexibility, as conditions can impact the timing of dives and return to port.
Is equipment rental available?
Yes, equipment rental is available for various items, though it typically incurs an additional cost. Divers can rent items like wetsuits, BCDs, regulators, masks, fins, and cylinders.
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