'Region' evolved from a line drawn in a direction to the territory that line defines — from 'regere' (to direct).
An area of land or division of the world having definable characteristics but not always fixed boundaries; an administrative district of a country; a part of the body.
From Anglo-Norman 'regiun,' from Latin 'regiōnem' (accusative of 'regiō'), meaning 'direction, boundary line, district, territory,' from 'regere' meaning 'to direct, to rule, to keep straight.' The PIE root is *h₃reǵ- (to move in a straight line, to direct, to rule). The original sense was a line drawn in a particular direction, which came to mean a boundary, and