Source : Webster's Revised Unabridged Dictionary (1913)

Campagna \Cam*pa"gna\, n. [It. See {Campaing}.]
   An open level tract of country; especially ``Campagna di
   Roma.'' The extensive undulating plain which surrounds Rome.

   Note: Its length is commonly stated to be about ninety miles,
         and its breadth from twenty-seven to forty miles. The
         ground is almost entirely volcanic, and vapors which
         arise from the district produce malaria.