Johnson's Reef

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What you'll see (20)

Onespot DemoiselleChrysiptera unimaculataseen 6× near here

Ocellaris AnemonefishAmphiprion ocellarisseen 5× near here

Indian Redfin ButterflyfishChaetodon trifasciatusseen 4× near here

Indo-Pacific Sergeant MajorAbudefduf vaigiensisseen 4× near here

Blunt-end SeahareDolabella auriculariaseen 4× near here

Snake Sea CucumberSynapta maculataseen 4× near here

Swarthy ParrotfishScarus nigerseen 4× near here

Gymnodoris striataseen 3× near here

Red Saddleback AnemonefishAmphiprion ephippiumseen 3× near here

Andaman ButterflyfishChaetodon andamanensisseen 3× near here

Indian Vagabond ButterflyfishChaetodon decussatusseen 3× near here

Checkered SnapperLutjanus decussatusseen 3× near here

Bluering AngelfishPomacanthus annularisseen 3× near here

Tawny Hermit CrabCoenobita rugosusseen 3× near here

White DamselDischistodus perspicillatusseen 3× near here

Longnose FilefishOxymonacanthus longirostrisseen 3× near here

Lined BristletoothCtenochaetus striatusseen 3× near here

Doublebar RabbitfishSiganus virgatusseen 3× near here

Black Longspine UrchinDiadema setosumseen 3× near here

Vagabond ButterflyfishChaetodon vagabundusseen 2× near here

Planning a trip

4–7 days

worth going for

Flight, then a boat or domestic hop.

1,691km from Singapore — about 12h each way, so two of those days are travel. 14 dive sites within 25km, enough for several days of diving.

When people dive it

Busiest Jan, Mar, Apr, Dec · almost nobody dives it Jun, Jul.

From 2,921 logged sightings — when divers are in the water, which is not quite the same as when visibility is best.

Dive Crew is a dive group from Singapore. Members plan trips here, log their dives, and share their photos of each site.

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Monsoon

Good

October works.

India's side of the same sea, on the same southwest monsoon calendar.

The year here

JFMAMJJASOND

Best here: December, January, February, March, April.

Andaman and Nicobar Islands. Written by hand from how the season actually runs, calibrated against what the boats do, since a season that disagrees with the operators is wrong however good the meteorology behind it. It describes most years, not this one: the forecast above is what knows about next week.

Moon and tides

Waning gibbous

71% lit · day 20 of the lunar month

Neap tides

Neap tides — the smallest range of the month, so the weakest currents. Easy conditions and usually the clearest water, though a drift site may barely drift.

New 10 Oct Full 26 Oct

Phase computed here, not fetched. This is the spring/neap cycle, which sets how hard the water moves — not a tide table: no free source publishes high and low water for Southeast Asian reefs, and the range peaks a day or two after the moon does, by an amount that varies with the coast. For times on the day, ask the operator.

Getting there

~6h 36m

door to water, each way · 4 legs

FlightPort Blair (IXZ)~4h 45mFlight time plus the airports at both ends. A connection adds to it.Find flights →
Transferthe jetty~21 minHavelock is a two-hour ferry from here.Directions →
Ferrythe crossing~1hAt this distance the last stretch is a scheduled crossing rather than a dive boat, so book it before the flight — a missed sailing usually costs a day. Which crossing it is has been worked out from the distance and not from a timetable; ask the operator.
Dive boatJohnson's Reef~30 minThen the dive boat out from the island.

📍 Johnson's Reef on Google Maps 🧭 Route from Port Blair

Times marked ~ are estimated from straight-line distance and will be roughly right at best. The road legs are the ones Google Maps answers properly; it will not plan the ferry or the dive boat at all. A dive site's coordinates put a pin in open water, so the map link drops you on the site, not on a jetty.

Details

Type: Johnson's Reef
Island: Havelock Island
Country: Andaman Islands
Marks: 12°4.703'N 92°57.121'E
Position: 12.0784, 92.9520

Where it is

Loading the map…

Nearby

Sightings and photographs from iNaturalist contributors, research-grade records within 6km, under Creative Commons licences. Counts are what divers and snorkellers have bothered to log — a common fish with few records is common all the same.