Douzelage is a town twinning association with one town from each of the member states of the European Union and the United Kingdom.
Monument commemorating the 20th anniversary of the Douzelage on 3 September 2011 in Marsaskala, Malta
A sister city or a twin town relationship is a form of legal or social agreement between two geographically and politically distinct localities for the purpose of promoting cultural and commercial ties.
Fingerposts in Oskarshamn, Sweden, listing its twin towns: Middelfart, Denmark; Mandal, Norway; Pärnu, Estonia; Korsholm, Finland; and Hibiscus Coast, South Africa.
Example of a twinning agreement between Castellabate, Italy ('gemellaggio') and Blieskastel, Germany ('Partnerschaft')
From left, mayors Kåre Nordgård of Tromsø and George M. Sullivan of Anchorage, Alaska meet in September 1969 to kick off their sister city relationship.
Column dedicated to Paris in Rome