The Belgian Lorraine is often considered to be a sub-region of the Ardennes
, but it may also be considered as geologically unified with the French Lorraine region to the south, or as a slow transition between the Ardennes and the French Lorraine. The hills are lower and gentler than in the Ardennes proper, and the climate is milder. About half of the land is forested. Iron ore is a major natural resource, and iron mining is a major industry, as in the French Lorraine.