Boso Peninsula

Written by DiveJourney. Built from public sources and local operator knowledge. Last updated Nov 3, 2026.

• JNTO Chiba diving guide - Locates Ito, Nishikawana, Banda, Okinoshima, Katsuura and Namegawa; identifies specific sites, shore versus boat use, and wildlife. Broad destination context, not proof of current individual-site access.
• JNTO Chiba dive destinations - Describes Boso regional geography and distinguishes Chiba Ito from the unrelated Ito in Shizuoka; historic Hazama and shark-feeding descriptions.
• BOMMIE English visitor and safety guidance - Primary Ito operator: AOW, 30 logged dives, recent boat experience, depth and currents; international visitor prices, temperatures, language-specific reservation paths, transport and yoke regulator connection.
• BOMMIE booking conditions - Primary Ito local booking page: current exposure and rope entries; 30-dive condition July-October and recommendation for relatively weaker currents November-June.
• BOMMIE site descriptions and animal protocol - Primary source for Ito Shark City Central, West and East, depth, operator-managed feed, animal welfare and mandatory gloves.
• BOMMIE operator FAQ - Primary seasonal descriptions, cold-water protection, wildlife periods and prebooking procedure; promotional sighting claims are not guarantees.
• BOMMIE Japanese price and dive limitations - Primary domestic/Japanese-language price context and explicit suspension of introductory shore diving at Ito.
• BOMMIE overseas reservations - Lists English/Chinese-speaking partners and alternate Tateyama and Tokyo arrangements; consult individual sellers for availability.
• Katsuura City Tourism Association dive page - Municipal-affiliated visitor information confirms Katsuura guide access, reef, pelagics, macro and certified-only outer boat sites.
• Katsuura Diving Service official - Primary currently advertised Katsuura training, introductory scuba, shore/boat and snorkel offerings.
• Katsuura Diving Service fun diving prices - Primary guide price examples, included services and computer rental notes for Katsuura.
• Katsuura Diving Service introductory dives - Primary beginner try-dive offering and stated shallow depths, price, age and all-year marketing.
• Katsuura Diving Service snorkeling - Primary supervised snorkel offer, price and stated year-round service, subject to sea conditions.
• PADI Katsuura Diving Service listing - Independent training agency corroboration of Katsuura resort, training and snorkel services, Japanese operating language.
• Namegawa Diving Service official - Fishery-cooperative-operated Namegawa access and operator journal dated through Oct 2026; day-by-day visibility and temperature variability.
• PADI Namegawa Diving Service listing - Independent listing of Namegawa boat, tank and gear services and contact details.
• Katsuura Marine Support Outer - Primary Namegawa local guide offering recreational, introductory and courses; check direct requests and site access.
• Ocean Tateyama guided snorkeling - Tateyama primary guided snorkel provider, Saka or Nishikawana beaches, qualifications, 2026-published price examples and weather-driven venue changes.
• Ocean Tateyama PADI skin diver course - Local shallow breath-hold and surface-skill training offer. Does not verify deep AIDA freediving, depth sessions or competition supply.
• Ocean Tateyama fees - Operator-specified snorkel and scuba pricing to ground approximate spending categories; reconfirm before booking.
• Tateyama City seasonal swimming beaches - Official 2026 supervised beach period ended 23 August; access, public facilities, Okinoshima constraints and Hazama beach parking.
• Tateyama City dangerous swimming locations - 2026 municipal warning against swimming or independent snorkeling off Okinoshima north/west, Heisura and Mera.
• Tateyama City Okinoshima contribution - Voluntary 2026 Okinoshima conservation contribution amounts and period; special natural-park and eelgrass/coral setting.
• Tateyama City Okinoshima etiquette - No spearfishing or unauthorized collecting; respect adjoining military air-base boundaries and keep rubbish out.
• Chiba Prefecture sea harvesting rules - Current fisheries rights and legal restrictions on taking shellfish and other marine organisms.
• Chiba Prefecture nature-park permit information - Special-park activities may require separate permissions; being in a park does not convey unrestricted entry or construction rights.
• Katsuura City bathing beaches - Official description of Ubara, Moriya and Okitsu bathing beaches and rail-access landmarks; season and lifeguard schedules require rechecking.
• Katsuura City tourism and 2026 beach updates - Official archive notes 2026 bathing season termination announced in August.
• Katsuura City morning market - Primary city description of long-running morning market and seasonal local produce.
• Katsuura City underwater observation park - Primary listing of Katsuura underwater observation tower as a land-based non-diver stop, hours subject to status and sea state.
• Tateyama City museum and castle hours - Primary Tateyama Castle and museum visiting hours and days closed.
• JNTO Kyukamura Tateyama - Identifies a real Tateyama hot-spring and overnight option for non-divers.
• JR East October 2026 Wakashio example - October 2026 JR East limited-express service evidence for Tokyo-Katsuura; check current departure times.
• JMA typhoon statistics and seasonality - Meteorological agency: July-October is the main Japanese typhoon approach season; no individual-dive weather guarantee.
• JMA Japan climate overview - Rainy-season and autumn-front context; regional rather than site-level marine forecasting.
• Japan MOFA short-stay visa exemption - Official nationality-based short-stay rules and exceptions; confirm applicable passport and entry purpose.
• Chiba Prefecture emergency medical hospitals - Identifies Shioda Hospital Katsuura and other recognized emergency institutions; not a guarantee of hyperbaric facilities.
• Chiba Prefecture 7119 medical advice - Local 2026 medical triage phone #7119 and emergency priority 119.
• DAN Japan medical hotline - DAN Japan: call 119 or 118 first for life-threatening diving emergencies, then member dive medicine consultation +81-3-3812-4999.
• CDC scuba diving injuries - DCS/AGE first aid, oxygen, professional assessment and evacuation planning.
• JNTO visitor emergency hotline - JNTO 24/7 multilingual visitor line and Japan emergency contact numbers.
• JNTO electricity and plug guidance - 100V and east-Japan 50Hz; two-flat-pin plugs.
• JNTO currency and ATM advice - JPY cash, foreign card-friendly Seven Bank and Japan Post ATMs, and variable fees.
• JNTO tipping etiquette - Tipping is not customary in Japan.
• JNTO Tateyama Castle - Cultural visit and accessible hilltop castle park in Tateyama.
• Destination hero photo by erika m - Unsplash License. Photographer profile: https://unsplash.com/@epsika | Location: Katsuura, Chiba, Bōsō Peninsula, Japan