Territorial typologies manual - island regions
Classes for the typology and their conditions
Details of the typology
The island typology is a classification based on the following two categories:
- island regions;
- non-island regions (those regions that are not defined as island regions).
Methodology for the typology
Island regions are NUTS level 3 regions that are entirely composed of one or more islands. In this context, islands are defined as territories having:
- a minimum surface of 1 km²;
- a minimum distance between the island and the mainland of 1 km;
- a resident population of more than 50 inhabitants;
- no fixed link (for example, a bridge, a tunnel, or a dyke) between the island(s) and the mainland.
In order to determine whether or not the above criteria are met, Eurostat uses geographical information systems of the European Commission (GISCO) which provide, among others, thematic geospatial information and information on transport networks.
NUTS level 3 island regions may correspond to a single island or they may be composed of several islands. Furthermore, an island region may be part of a bigger island that contains more than one NUTS level 3 regions: for example, the regions that compose Ireland and Northern Ireland, Corsica, Sardinia, Sicily or Crete.
The typology of island regions may (optionally) be used to distinguish five different subcategories, depending on the size of the major island related to the NUTS level 3 region in question:
- regions where the major island has < 50 000 inhabitants;
- regions where the major island has 50 000 - < 100 000 inhabitants;
- regions where the major island has 100 000 - < 250 000 inhabitants;
- regions corresponding to an island with 250 000 - < 1 million inhabitants, or regions that form part of such an island;
- regions that form part of an island with ≥ 1 million inhabitants.
Note that the definition of an island region is such that it must be entirely composed of islands. There are many examples of islands in the EU that form part of a NUTS level 3 region characterised by its islands, but where part of the territory also contains mainland areas and where, as a result, the region is classified as a non-island region. For example, this is true along the whole of the Adriatic coastline in Croatia where each NUTS level 3 region is concurrently composed of a mainland territory and islands.
Note that the regions of Great Britain are not considered as island regions as Great Britain is connected to continental Europe by a tunnel under the English Channel and therefore does not meet the criteria of being an island. Equally, Bornholm is the only island region in Denmark, as all other regions either contain a combination of mainland and islands, or are composed of islands connected to the mainland by way of a bridge and/or tunnel. Note the island typology is not defined/recognised within the NUTS Regulation, although the NUTS level 3 regions themselves are defined therein.
Links to other spatial concepts/typologies
Based on the above definitions, of the 1 348 NUTS 2016 level 3 regions there are just 76 island regions in the EU-28 and 1 272 non-island regions.
Map 1 provides an overview of the final classification for the island typology.
Changes to the typology over time
The island typology was initially defined for a Eurostat publication titled, Portrait of the islands, which provided information on all of the inhabited islands within the EU, except for islands with a national capital city. This meant that Ireland and the United Kingdom were excluded from the typology (the publication was released before the Channel tunnel was in operation). For a Green Paper on Territorial Cohesion (COM(2008) 616 final), an alternative approach was adopted, based on those regions whose entire population lived on an island.
Thereafter, the most recent changes made to the island typology were developed by the Directorate-General for Regional and Urban Policy in association with Eurostat, whereby the classifications were simplified (as described above) by removing the criteria for the presence of a national capital, which meant that Ireland, Malta, Cyprus and Iceland could be included as island regions (despite the presence of a national capital).
Changes over time that impact on the classification
The island regions classification should be updated to reflect any changes to the underlying sources of information that are used in its compilation, in other words, changes to geospatial data (for example, the construction of a new bridge or tunnel) or changes to the boundaries of NUTS level 3 regions.
The NUTS Regulation specifies that the classification of regions should remain stable for a period of at least three years; the most recent updates were for NUTS 2010, NUTS 2013 and NUTS 2016. After each revision of the NUTS classification, the boundaries of the regions should be re-assessed to see if they have impacted on the delineation of any island regions (for example, an island region may be merged with a mainland region).
The next update of the NUTS classification is foreseen to take place in 2019.
A variety of different statistical surveys collect data for NUTS level 3 regions and this information may be used to calculate data for island and non-island regions. This process involves aggregating the data for NUTS level 3 regions to compute a total or an average for all island (and non-island) regions within a territory (for example a Member State, or the EU as a whole).
Eurostat publishes data for the island typology through Regions and cities illustrated.
Eurostat’s website provides information for a wide variety of indicators for the island typology. These statistics are available for the following statistical domains: demography, population projections, the labour market, crimes recorded by the police, economic accounts, business demography, intellectual property rights and transport. They are available here.