A "rock reef" is a cluster or formation of rocks found underwater, usually near the surface or just below it. The rocks can create obstacles or hazards for boats and ships navigating the area.
Sentences with «rock reef»
Ride on high tides, low tides, rock reef breaks or sandy beach breaks; the camp is a perfect point for a surfing expedition. (costaricasurfing.org)
Don't forget to watch out for the large rock reef. (sa-venues.com)
The beach is sand with exposed rock reef and small tide pools. (inside-peru.com)