This may not bee an errer -
from http://en.wiktionary.org/wiki/champian :
champian (plural champians)
A plain; a flat expanse of land; a champaign.
A species of landscape that is flat and open.
The level open countryside, as distinct from the mountains, forests or towns.
(agricultural) common land; land that is not enclosed
Someone who farms land that is not enclosed.
A battlefield, especially when flat and open.
A field of inquiry or study.
champian (not comparable)
Flat or level and open, like a champian.
Level; equal; on a par with one another.
(agricultural) Of land that is not enclosed; of land that is common.
Pertaining to land that is not enclosed.