English: high energy infralittoral rock
Welsh: craig isforlan fas egni uchel 
Subject: Amgylchedd
Welsh definition: Infralittoral rock includes habitats of bedrock, boulders and cobbles which occur in the shallow subtidal zone and typically support seaweed communities. The upper limit is marked by the top of the kelp zone whilst the lower limit is marked by the lower limit of kelp growth or the lower limit of dense seaweed growth. Rocky habitats in the infralittoral zone subject to exposed to extremely exposed wave action or strong tidal streams.
Notes: Term o system ddosbarthu EUNIS o gynefinoedd morol. IR HIR. yw’r Cod Cynefin. Mae’r Cyd-bwyllgor Cadwraeth Natur yn defnyddio system arall o gategoreiddio cynefinoedd morol, yn seiliedig ar system ddosbarthu EUNIS. Yn y drefn honno “high energy shallow water rock” yw’r term cyfatebol.