Article 4

For cross-border cooperation, the regions to be supported by the ERDF shall be the NUTS level 3 regions of the Union along all internal and external land borders with third countries or partner countries and all NUTS level 3 regions of the Union along maritime borders separated by a maximum of 150 km of sea, without prejudice to potential adjustments needed to ensure the coherence and continuity of cooperation programme areas and where cross-border interaction may effectively take place. Internal cross-border cooperation Interreg programmes may cover regions in Norway, Switzerland and the United Kingdom which are equivalent to NUTS level 3 regions as well as Andorra, Liechtenstein, Monaco and San Marino. For external cross-border cooperation, the regions to be supported by IPA III or NDICI shall be NUTS level 3 regions of the respective partner country or, in the absence of a NUTS classification, equivalent areas along all land and maritime borders between Member States and partner countries eligible under IPA III or NDICI, without prejudice to potential adjustments needed to ensure the coherence and continuity of cooperation programme areas.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-02 · Text as adopted (Official Journal); later amendments are not incorporated in this text.