A hundred is a geographic division formerly used in England, Wales, Denmark, South Australia, some parts of the United States, Germany (Southern Schleswig), Sweden, Finland and Norway, which historically was used to divide a larger region into smaller administrative divisions.
The name "hundred" is derived from the number "one hundred". It may once have referred to an area liable to provide for a hundred men under arms, or containing roughly a hundred homesteads. It was a traditional Germanic system described as early as AD 98 by Tacitus (the centeni). Similar systems were used in the traditional administrative regimes of China and Japan.