Castle Rock

Nusa Tenggara Timur, Indonesia35 m maxadvanced

Conditions & tides

Channel site — tidal current funnels through here and can run fast, changing quickly with the tide. It is usually strongest around mid-tide and eases near the slack windows below. Dive with a local operator who knows the timing.

Castle RockNusa Tenggara Timur · 35 m

Good · 5/5

conditions visualisation

Good5/5

Calm and diveable right now — best window today 8 AM–6 PM.

Wind7 kn E

Current~0.4 kn WSW · model

Swell

0.4 m · 4s · NE

Water

28 °C

Conditions through the day

7 AM7 PM

Calmest current near slack — 04:45 PM & 05:15 AM local

Sunrise 05:49 AM · Sunset 05:57 PM local

Show details

Tide · local

Outlook — select a day for full conditions

On-face swell 0.3 m — the component of the swell aimed at this site’s exposed face. Strong-current reef: plan a drift and enter near the slack windows above. Current is a regional model value (Copernicus, ~9 km grid) — a guide to the area, not a precise reef measurement. Imagery © Esri · not depth or visibility.

Scored by DiveConnect's site-physics model

Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.

Dived here today? How were conditions vs. what we showed?

About this site

Castle Rock lies in Nusa Tenggara Timur, in the waters of eastern Indonesia's Lesser Sunda chain, over a rocky bottom that reaches a maximum depth of around 35 metres. It is rated an advanced dive due to strong and often unpredictable currents, with good visibility typical on the site. Divers regularly encounter barracuda, batfish, eagle rays, fusiliers, mackerel, manta rays, humphead wrasse, surgeonfish, trevally, and tuna, and some have also reported bumphead parrotfish, groupers, hammerhead sharks, jacks, nurse sharks, reef sharks, snapper, and bannerfish. The current here can shift quickly and produce downcurrents and eddies, and a negative entry is sometimes used to get divers down through the surface conditions before the drift begins.

AI overview

Marine life here

Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.

Reef sharkReef sharkReported here · unconfirmed
Jack / amberjackJack / amberjackReported here · unconfirmed
TunaTunaConfirmed present · 8 independent sources
GrouperGrouperReported here · unconfirmed
SnapperSnapperReported here · unconfirmed
SurgeonfishSurgeonfishConfirmed present · 3 independent sources
Manta rayManta rayConfirmed present · 2 independent sources
BannerfishBannerfishReported here · unconfirmed
Whitetip Reef SharkTriaenodon obesusReported here · unconfirmed
Bignose UnicornfishNaso vlamingiiReported here · unconfirmed
Giant MorayGymnothorax javanicusReported here · unconfirmed
Giant TrevallyCaranx ignobilisReported here · unconfirmed
Moorish IdolZanclus cornutusReported here · unconfirmed
Yellow BoxfishOstracion cubicumReported here · unconfirmed
Clark's AnemonefishAmphiprion clarkiiReported here · unconfirmed
Blacklip ButterflyfishChaetodon kleiniiReported here · unconfirmed
Schooling BannerfishHeniochus diphreutesReported here · unconfirmed
Sixband AngelfishPomacanthus sexstriatusReported here · unconfirmed
BarracudaBarracudaConfirmed present · 5 independent sources
Hammerhead sharkHammerhead sharkReported here · unconfirmed
MackerelMackerelConfirmed present · 2 independent sources
Eagle rayEagle rayConfirmed present · 3 independent sources
TrevallyTrevallyConfirmed present · 6 independent sources
Napoleon (humphead) wrasseNapoleon (humphead) wrasseConfirmed present · 6 independent sources
BatfishBatfishConfirmed present · 2 independent sources
Nurse sharkNurse sharkReported here · unconfirmed
Bumphead parrotfishBumphead parrotfishReported here · unconfirmed
FusilierFusilierConfirmed present · 6 independent sources