For the maps the NUTS regions are internationally standarized (ISO norm) these regions should be built-in to the maps.

RE: For the maps the NUTS regions are internationally standarized (ISO norm) these regions should be built-in to the maps.

The NUTS classification is used for Main statistical findings for 508.5 million inhabitants living in the European Union and to define regional boundaries and determine geographic eligibility for structural and investment funds.

The current NUTS 2013 classification lists 98 regions at NUTS 1, 276 regions at NUTS 2 and 1342 regions at NUTS 3 level.

The NUTS classification (Nomenclature of territorial units for statistics) is a hierarchical system for dividing up the economic territory of the EU for the purpose of :

The collection, development and harmonisation of European regional statistics
Socio-economic analyses of the regions

NUTS 1: major socio-economic regions
NUTS 2: basic regions for the application of regional policies
NUTS 3: small regions for specific diagnoses

More at: http://ec.europa.eu/eurostat/web/regions/overview