The harmonised multiscale maps of the seabed substrate have been released today by EMODnet Geology. Diverse national seabed substrate data classifications are brought together, harmonised and collated using the Folk classification system of 5, 7 and 16 classes. The maps illustrate seabed properties at different scales – 1:50 000, 1:100 000, 1:250 000 (250 k) and 1:1 000 000 (1 M) – covering all European maritime areas in one product. The broad scale data (250 k and 1 M) describes the seabed substrate at a general level, suitable for the decision-making, research and large-scale spatial planning. More detailed scale data are needed, for instance, for habitat mapping purposes and planning local constructions like wind farms. The maps of the seabed substrate are now available on the EMODnet Geology portal.