A current EU geographical distribution of spatial information for the 37 Invasive Alien Species (IAS) of Union concern (IAS Regulation 1143/2014) is set, based on the best available knowledge, resulting from an assessment of data aggregated through the European Alien Species Information Network (EASIN) in collaboration with the Member States (MS) Competent Authorities of 18 EU countries. This baseline is an important tool supporting the implementation of the IAS Regulation and also provides a factual basis for the review of the application of the IAS Regulation. Ultimately, the information included can be used for monitoring the achievement of Target 5 of the EU Biodiversity Strategy to 2020 for combatting IAS, but also to the implementation of other EU policies with requirements on alien species, such as the Birds and Habitats Directives, and the Marine Strategy and Water Framework Directives.JRC.D.2-Water and Marine Resource