Reef Break

Le terme reef-break est un anglicisme utilisé notamment par les surfeurs pour désigner un fond marin composé de roches ou de coraux alors que le beach-break est un fond de sable. Pour débuter en surf, il vaut donc mieux surfer sur un beach-break.
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(Dialeto do Surf)
Praia com fundo de coral.

When a swell finds its path impeded by a shallow underwater reef, it jacks up to form a wave. If the reef is at a slightly different angle to the swell, the wave will peel, creating perfect conditions for wave-riding.
However, a reef-break can be the most dangerous wave to ride as the water is often extremely shallow at the bottom of the wave, and a mistake can mean that the wave pummels you into the reef. If it's a coral reef, it can cut you up badly. All the world's most famous waves are reef breaks: Pipeline, Sunset, Ho'okipa, Waimea, Ma'alaea, etc.