The sub-province which forms the subject of this study has little flat land. The hills begin close to the river and rise, sometimes steep, sometimes less inclined, but always climb until its boundaries are reached. On the lower slopes there is brushwood, coarse grass and stunted pine. Higher up, there are small oak trees growing among the fields. Higher still, the brushwood gives way to flatter areas of sweet pasture and there are patches of deciduous pine forest.