The history of Allier corresponds to the Duchy of Bourbon with which it shares almost the entire territory .
The influence of topography , especially in the valleys of Cher and Allier , also contributes to the north variance .
The history of Allier corresponds to the Duchy of Bourbon with which Allier shares almost the entire territory .
The influence of topography , especially in the valleys of Cher and Allier , also contributes to the north variance .