region(A designated area or an administrative division of a city, county or larger geographical territory that is formulated according to some biological, political, economic or demographic criteria)
regional authority(The power of a government agency or its administrators to administer and implement laws and government policies applicable to a specific geographical area, usually falling under the jurisdiction of two or more states)
regional convention(An assembly of national, political party or organizational delegates representing persons or the interests of a specific geographic area, or the pact or the agreement that arises from such an assembly)
regional development(The progress or advancement for a large geographical territory or a designated division of a country or state, particularly in economic growth that leads to modernization or industrialization)