English: sublittoral mixed sediment
Welsh: gwaddod cymysg isforlannol 
Subject: Amgylchedd
Welsh definition: Sediment habitats in the sublittoral near shore zone (i.e. covering the infralittoral and circalittoral zones), typically extending from the extreme lower shore down to the edge of the bathyal zone (200m). Sublittoral mixed (heterogeneous) sediments found from the extreme low water mark to deep offshore circalittoral habitats.
Notes: Term o system ddosbarthu EUNIS o gynefinoedd morol. SS.SMx. 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 “subtidal mixed sediment” yw’r term cyfatebol.