"Baltic photic rock and boulders characterized by macroscopic epibenthic biotic structures"@en . . "SDN:M23::AA-A1" . "The habitat 'Baltic photic rock and boulders characterized by macroscopic epibenthic biotic structures' as defined under the HELCOM HUB classification system. For more information visit 'http://helcom.fi/baltic-sea-trends/biodiversity/helcom-hub/hub/aa-a1'."@en . .