Existing cross-prefectural fora of cooperation between local governments in the Tokyo metropolitan area are the Kantō regional governors' association (Kantō chihō chijikai) and the "Shutoken summit" (formally "conference of chief executives of nine prefectures and cities", 9 to-ken-shi shunō kaigi).
Forum kerja sama lintas-prefektur yang ada antara pemerintah daerah di daerah metropolitan Tokyo adalah asosiasi gubernur regional Kantō (Kantō chihō chijikai) dan "Pertemuan Shutoken" (secara formal "konferensi kepala eksekutif sembilan prefektur dan kota", 9 to-ken-shi shunō kaigi).