4. Member States shall determine and map urban ecosystem areas as referred to in Article 8 for all their cities and towns and suburbs.
The urban ecosystem area of a city or of a town and suburb shall include:
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(a)
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the entire city or town and suburb; or
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(b)
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parts of the city or of the town and suburb, including at least its urban centres, urban clusters and, if deemed appropriate by the Member State concerned, peri-urban areas.
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Member States may aggregate the urban ecosystem areas of two or more adjacent cities, or two or more adjacent towns and suburbs, or both, into one urban ecosystem area common to those cities, or towns and suburbs, respectively.