The dataset contains coastal defence and flood protection data that was made available by HELCOM Contracting Parties in response to a data call. Data were collected by the HELCOM Secretariat in 2022. Data were reported by Denmark, Finland, Germany, Poland and Sweden.

For Latvia, the dataset was classified as no data available. Estonia and Sweden requested the use of HOLAS 2 data. HOLAS 2 data was also used to complement data from Poland and Denmark.

Attribute specification and units with predefined values specified from the data call Name: name of the structure for polygon format Zone: Location of the site for line format Type: Type of structure (sea walls, breakwaters, groynes, flood protection, gabions, stone protection, dike, other) Year: Year of construction, especially if built between 2016-2021 Status: Status of the structure harmonized with the values from a predefined list (operational, under construction, application submitted, planned, approved, other), and following a precautionary approach that attributed the value operational for values that were out of the predefined list Dimension: Spatial dimensions of the structure in m2 Notes: notes regarding the reported data and HOLAS 2 data indication. Status_original: original status declared by the Contracting Parties