Bocage bourbonnais  Le Bocage bourbonnais is a small French natural region, west of the Allier department in Auvergne. Its name stems from the ancient province of Bourbonnais. Le bocage lies in the Bourbonnais natural region, west of the Allier and Cher rivers, around Cosne-d'Allier and Bourbon-l'Archambault. It is surrounded by the following natural regions: