Assembly of European Regions (AER)

From the AER web site:

 

The Assembly of European Regions (est.1985) is the largest independent network of regions in the wider Europe.

Bringing together more than 250 regions from 35 countries and 16 interregional organisations, AER's mission is to:
 

• Promote the principle of subsidiarity and regional democracy
• Increase the regions' political influence within the European institutions
• Support the regions in the process of European enlargement and globalisation
• Facilitate interregional cooperation across wider Europe and beyond