Amami-Ōshima Diving — Japan

Amami-Ōshima is a UNESCO-listed subtropical island between Kyushu and Okinawa, where dense mangrove forests meet crystal reefs in a rarely dived setting. Humpback whales calve in the surrounding waters from January to March, while the reefs host a unique blend of temperate and tropical species. It remains under the radar for international divers, offering an authentic Japanese island experience.

Score
70.7 / 100
Country
Japan
Region
Pacific Ocean
Area
Kagoshima Prefecture
Nearest airport
Amami Airport (ASJ)
Visibility
15–35 m
Water temperature
20–29 °C
Max depth
35 m
Current strength
mild
Dive types
reef, macro, cave, drift
Best months
May, June, July, August, September, October
Minimum certification
Open Water
Access type
boat
Average 2-tank dive cost
$100 USD
Budget tier
mid range
Key species
humpback whale, green turtle, sea snake, nudibranch, pygmy seahorse, anemonefish
Google rating
4.6 (180 reviews)
Top operators
Dive Species Amami, Native Sea Amami
Nearest hyperbaric chamber
Kagoshima University Hospital Hyperbaric Unit (~350 km)
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World Class
Beginner Friendly
Amami-Ōshima
JapanPacific Ocean
70.7

SCORE

28.3850°N

129.4914°E

Amami-Ōshima is a UNESCO-listed subtropical island between Kyushu and Okinawa, where dense mangrove forests meet crystal reefs in a rarely dived setting. Humpback whales calve in the surrounding waters from January to March, while the reefs host a unique blend of temperate and tropical species. It remains under the radar for international divers, offering an authentic Japanese island experience.

Subtropical Mangrove Meets Open Ocean

Visibility15–35 m
Temperature20–29°C
Max Depth35 m
Currentmild
2-Tank Dive$100
Best MonthsMay, June, July, August
CertificationOpen WaterBeginner Friendly

Score Breakdown

Click any score to see a detailed breakdown

ML72.0CH72.0VIS72.0SV68.0TMP75.0DA62.0OP72.0TS75.0GT65.0VAL72.0CRD85.0SP58.0

Marine Life

72.0

Species diversity, megafauna encounters, reef fish abundance, macro life, and endemic species.

Species Diversity
70
Megafauna Encounters
68
Reef Fish Abundance
72
Macro Life
80
Endemic Species
70
Marine Life Diversity
72.0
Coral & Reef Health
72.0
Visibility & Conditions
72.0
Dive Site Variety
68.0
Water Temperature
75.0
Depth & Access
62.0
Operator Quality
72.0
Topside Experience
75.0
Getting There
65.0
Value & Cost
72.0
Crowding
85.0
Social Proof
58.0

Key Species

humpback whalegreen turtlesea snakenudibranchpygmy seahorseanemonefish

Dive Types

reefmacrocavedrift

Traveling with Non-Divers?

Your non-diving travel companions will find plenty to enjoy topside while you're underwater. Here are some activities to consider.

Activities for Non-Divers

mangrove kayakingAmami rabbit night toursbeach hoppingbrown sugar shochu tasting

Nearby Cultural Sites

  • Oshima Tsumugi textile museum
  • Tanaka Isson art museum

Non-Diver Partner Score

7/10

Good topside options for non-diving companions.

Family FriendlyYes
Restaurants & Nightlifebasic

Safety & Emergency

Dive Insurance

Dive insurance is essential. Standard travel insurance often excludes scuba diving. We recommend DAN (Divers Alert Network) for comprehensive dive accident coverage.

Learn More at DAN.org
Hyperbaric Chamber350 km — Kagoshima University Hospital Hyperbaric Unit
Nearest Hospital10 km

Amami has a regional hospital; hyperbaric chamber requires air evacuation to Kagoshima — dive conservatively

Skill LevelBeginner Friendly
Current Strengthmild

Top Operators

Dive Species Amami

PADI

4.7
110 reviews

Native Sea Amami

SSI

4.6
75 reviewsNITROX
Compare This Dive Site
Honest reality check

What your dive shop won't tell you

The minimum certification printed on a brochure is the legal floor, not the honest recommendation. Here's what we actually think you should bring to this site.

Recommended logged dives
55+

Below this we'd send you somewhere easier first.

Recommended certification
Cavern Diver minimum. Full Cave certification for anything past the daylight zone.
“Accessible to most certified divers with basic open water skills.”

What will challenge you

  • →Recreational limit of 40 m is reachable here (max depth 35 m). Gas planning and NDL tracking matter.
  • →Cooler than most tropical sites — 20°C minimum. A 5 mm wetsuit is the floor for longer dives.
  • →Overhead environment. Standard recreational training does not cover you past the entrance. People die here doing what they'd do on an open reef.
  • →Nearest hyperbaric chamber is ~350 km away. Evacuation is slow. Dive conservative profiles and get DAN insurance before you fly.
  • →Variable visibility
  • →Deep profiles

What will surprise you

  • →Thermoclines can drop water temp by 9°C between the surface and depth. Your wetsuit choice should match the minimum, not the average.
  • →Amami-Ōshima has more marine life variety than most divers expect
  • →Local operators know spots the guidebooks miss
Time of day

When to dive it

Every dive shop gives you this briefing at 7am. We just wrote it down. Tidal dependency: slight. Optimal window: First light to 11am for best visibility..

Morning
  • Viz
    peak
  • Current
    mild
  • Crowd
    light
  • reef exploration
  • photography

Best light and calmest conditions before afternoon wind picks up.

Afternoon
  • Viz
    moderate
  • Current
    mild
  • Crowd
    moderate
  • drift diving
  • second tank

Wind chop can reduce viz. Still diveable but morning is better.

Month-by-month

Dive forecast

Realistic conditions by month. Viz ranges are what you should actually expect, not best-case marketing numbers. Confidence % is the share of days that match this profile historically.

Month Viz (m) Temp (°C) CurrentSea RainConfidenceHighlights
Jan15–2520MildModLight70%reef fish active, peak season crowds
Feb15–2520MildModLight70%reef fish active, peak season crowds
Mar15–2520MildModLight70%reef fish active, peak season crowds
Apr15–2520MildModLight70%reef fish active
May30–3529MildCalmDry70%reef fish active
Jun30–3529MildCalmDry70%reef fish active
Jul30–3529MildCalmDry70%reef fish active
Aug30–3529MildCalmDry70%reef fish active
Sep30–3529MildCalmDry70%reef fish active
Oct15–2520MildModLight70%reef fish active
Nov15–2520MildModLight70%reef fish active
Dec15–2520MildModLight70%reef fish active
Shoot here

Photography brief

Subjects are only half the shot. A perfect macro site is useless in a three-knot drift, and a wide-angle dream is useless at 35 m with a murky ceiling. These are the conditions, not the hype.

Macro subjects74
Wide angle64
Viz stability68
Hover friendliness100
Natural light7

Recommended kit

  • →Macro lens (60mm or 105mm), focus light, dual strobes positioned for fill
  • →Two independent light sources minimum; video lights beat strobes in caverns
Level up here

What this site will teach you

The dives that made you a better diver are the ones that made you uncomfortable for the right reasons. Here's what this site will quietly train you for.

What it costsEstimates — calibration pending

7-day trip, per person

Rough ranges anchored to existing regional data — not booking quotes. Land-based trip, standard breakdown.

Budget
$1,950–$2,850

Hostels, shore diving, cheap eats

Flights (RT from US)
$720–$880
Accommodation / day
$50–$100
Diving / day
$90–$100
Food / day
$25–$50
Transfers + misc
$80–$230
Mid-range
$3,150–$4,850

3-star hotels, standard boat ops, mix of restaurants

Flights (RT from US)
$1,150–$1,450
Accommodation / day
$120–$220
Diving / day
$100–$130
Food / day
$55–$100
Transfers + misc
$80–$230
Splurge
$5,400–$8,650

Top resorts or liveaboards, premium operators

Flights (RT from US)
$1,800–$2,200
Accommodation / day
$260–$500
Diving / day
$130–$170
Food / day
$110–$220
Transfers + misc
$80–$230

Flights priced round-trip from a major US hub. Figures are per person on a shared room. Solo travelers add ~30% to accommodation.

Pair with

Build a trip around it

Most divers fly across the world for one destination and don't realise another worth-it site is 90 minutes away. Here are the honest pairings.

Best dive types here