Lagoon Triggerfish confirmed 4 months ago

Black Rock Cook Islands

Rarotonga, Cook Islands · Cook Islands

A dramatic basalt outcrop on Rarotonga's northwest coast drops into a wall that plunges to 40 metres, collecting seasonal manta rays between August and November when plankton blooms concentrate in the current along this exposed headland. The volcanic structure itself is worth the dive even outside manta season, with dense gorgonian sea fans and large barrel sponges colonising the wall below 20 metres.

Conditions

Depth

5 to 40 m

Advanced depths

Current

Often strong

Can pick up on the edge

Visibility

20 to 30 m

Clearest in the calm season

Water

23 to 29°C

3mm wetsuit

Month by month

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Water (°C)	27	27	27	26	25	24	23	23	23	24	25	26
Vis (m)	15	15	15	15	20	20	20	20	20	20	20	15
Current	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Strong	Strong	Strong	Strong	Moderate	Moderate