Signs of Mackinder's Heartland Theory can be found in the works of geopolitician Dimitri Kitsikis, particularly in his "Intermediate Region" model. There is a significant geographical overlap between the Heartland or "Pivot Area" and the Intermediate Region, with the exception of Germany-Prussia and north-eastern China, which Kitsikis excludes from the Intermediate Region. Mackinder, on the other hand, excludes North Africa, Eastern Europe and the Middle East from the Heartland.