North Irish Sea habitat extent classified to EUNIS habitat classification. The EUNIS habitat classification is a comprehensive pan-European system to facilitate the harmonised description and collection of data across Europe through the use of criteria for habitat identification. It is hierarchical and covers all types of habitat types from natural to artificial, from terrestrial to freshwater and marine. Data covers areas of the northern Irish Sea off the eastern coastline of Ireland. The data was acquired during 2003-2004. Multibeam echsounder data and seabed sampling data acquired during the INSS and INFOMAR national seabed mapping programmes were the primary sources of data used in the generation of this marine habitat map. Habitat classification supports further understanding of the nature of the seabed in the northern Irish Sea. Data interpretation undertaken by the Advanced Mapping Services team within the Ocean Science and Information Services section of the Marine Institute (Ireland). Data completed for area surveyed under the INSS programme.