The atlas provides a basic knowledge of the marine and coastal seabed as well as of their main communities and of the Posidonia meadow occurrences. Cartographic datasets are integrated by bibliographic material. The atlas was constructed based on the 1:10,000 regional technical chart (CTR) and this release is an upgrade of the maps provided in the “Atlante degli Habitat Marini della Liguria – Diviacco/Coppo-2006” approved by Liguria Region by D.G.R. #1444 – November 02, 2009. The spatial coverage of the atlas is the coastal belt of all the Liguria region. Data were collected by side scan sonar, ortophoto, aerial photo, R.O.V. and scuba surveys.