 With the 2011 Kallikratis plan, its powers and authority were redefined and extended.Along with the Western Greece and Ionian Islands regions, it is supervised by the Decentralized Administration of Peloponnese, Western Greece and the Ionian Islands based at Patras.The region is based at Tripoli and is divided into five regional units (pre-Kallikratis prefectures), 
which are further subdivided into 26 municipalities.