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Regio (pl. regiones) is the Latin word for ‘region’ and the Italian word for ‘royal’

It may refer to:

• Regiopolis, a concept for urban centers in between metropolitan areas.

Ancient toponymy

• Regiones of Augustan Italy, the departments in which Roman Emperor Augustus divided Italy.
• 14 regions of the Augustan Rome, in ancient Rome as a name for quartiers of the city of Rome
• 14 regions of Medieval Rome, resulting from the redivision of the Rome after the revolution of 1143
• Regio, in ancient Constantinople as a name for the 14 quarters of the city of Constantinople, defined in analogy with those of Rome
• Regio Aromatica, name for the Horn of Africa
• Regiones, administrative subdivisions of the kingdoms of Anglo-Saxon England

Astronomy

• Regio (astronomy), which, in planetary geology, is a large area of a planet or moon that is strongly differentiated in colour or albedo
  • A regio of Venus:
    • Alpha Regio
    • Asteria Regio
    • Beta Regio
    • Ovda Regio
  • A regio of Pluto:
    • Belton Regio
    • Lowell Regio
    • Tombaugh Regio
  • A regio of Titan:
    • Tui Regio
  • A regio of Ganymede:
    • Galileo Regio
  • A regio on Phoebe:
    • Leto Regio
  • A regio on Iapetus:
    • Cassini Regio

See also

• Regio Ducal, a former opera house in Milan
• Teatro Regio (disambiguation), several theaters in Italy
• Regio Esercito, the army of the Kingdom of Italy
• Regia Marina, the navy of the Kingdom of Italy
• Regio Esercito (World War II)
• The Stadler Regio-Shuttle, a German diesel railcar
• Regio Trans, a Romanian railway company
• Regio (Swiss railway train), a category of train service in Switzerland

• Disambiguation pages