The EMODnet (European Marine Observation and Data network) Geology project collects and harmonizes marine geological data from the European sea areas to support decision making and sustainable marine spatial planning. The partnership includes 39 marine organizations from 30 countries. The partners, mainly from the marine departments of the geological surveys of Europe (through the Association of European Geological Surveys-EuroGeoSurveys), have assembled marine geological information at different scales from all European sea areas (e.g. the White Sea, Baltic Sea, Barents Sea, the Iberian Coast, and the Mediterranean Sea within EU waters). This multiscale dataset include EMODnet seabed substrate maps at a scale of 1: 50 000, 1:100 000, 1: 250 000 and 1:

1 000 000 from the European marine areas, compiled in three subsequent projects running since 2009. Traditionally, European countries have conducted their marine geological surveys according to their own national standards and classified substrates on the grounds of their national classification schemes. These national classifications are harmonized into a shared EMODnet schema using Folk's sediment triangle with a hierarchy of 16, 7 and 5 substrate classes. The data describes the seabed substrate from the uppermost 30 cm of the sediment column. The data has been generalized into target scales of 1: 50 000, 1:100 000, 1: 250 000 and 1:

1 000 000. The smallest cartographic units within the dataset varies between 0.01 km2 and 4 km2 according to each scale. Further information about the EMODnet Geology project is available on the portal ( http://www.emodnet-geology.eu/).