In Canada, the word "bush" has been used since the 19th century to describe the hostile environment beyond the clearings and settlements. In bush flying it has been used to refer to flying in adverse, if not hostile, conditions in the remote expanses beyond the ribbon of settlement in southern Canada, into the "bush" of the Canadian Shield and the barren Arctic. By the end of WWI most of southern Canada had been linked by railways, but the North remained as inaccessible as ever by land. Its innumerable lakes and rivers did, however, provide alighting areas for water-based aircraft in summer and ski-equipped aircraft in winter.
Prior to the 1920's, vast portions of the Canadian north were uncharted and unknown. Bushflying was intrumental in opening up those vast regions.