Joan Rock

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What you'll see (20)

Red Rock CrabCancer productusseen 27× near here

Yellow Shore CrabHemigrapsus oregonensisseen 21× near here

Nuttall's CockleClinocardium nuttalliiseen 19× near here

Egg-yolk JellyPhacellophora camtschaticaseen 17× near here

Dungeness CrabMetacarcinus magisterseen 16× near here

Purple Mahogany ClamNuttallia obscurataseen 16× near here

Helmet CrabTelmessus cheiragonusseen 15× near here

Ochre Sea StarPisaster ochraceusseen 13× near here

Greater Moon JellyAurelia labiataseen 12× near here

Purple Shore CrabHemigrapsus nudusseen 10× near here

California Beach FleaMegalorchestia californianaseen 10× near here

Frilled DogwinkleNucella lamellosaseen 8× near here

Thatched BarnacleSemibalanus cariosusseen 7× near here

Shiner SurfperchCymatogaster aggregataseen 7× near here

Pacific Sand LanceAmmodytes personatusseen 7× near here

Painted AnemoneUrticina grebelnyiseen 7× near here

Pacific Acorn BarnacleBalanus glandulaseen 6× near here

Graceful Rock CrabMetacarcinus gracilisseen 6× near here

Pacific HerringClupea pallasiiseen 6× near here

Nanaimo DoridAcanthodoris nanaimoensisseen 5× near here

Planning a trip

8–13 days

worth going for

Long haul, usually two flights.

12,848km from Singapore — about 24h each way, so two of those days are travel. 23 dive sites within 25km, enough for several days of diving.

When people dive it

Busiest Apr, May, Jun, Jul, Aug.

From 29,770 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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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

~21h 30m

door to water, each way · 4 legs

FlightVancouver (YVR)~19h 36mFlight time plus the airports at both ends. A connection adds to it.Find flights →
Transferthe jetty~21 minRoad transfer to the coast, usually arranged by the resort or liveaboard.Directions →
Ferrythe crossing~1h 3mAt 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 boatJoan Rock~30 minThen the dive boat out from the island.

📍 Joan Rock on Google Maps 🧭 Route from Vancouver

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

Island: Sidney Island
Country: Canada
Marks: 48°41.400'N 123°19.000'W
Position: 48.6900, -123.3167

Site website →

Where it is

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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.