sentences:  The migration level (to the other regions, especially to Marmara Region) is high and population density (40 person/km²) is lower than the average for Turkey (98 person/km²).The migration toward other Turkey's regions and toward foreign countries is higher than the natural population increase, a fact which is leading to a slight decline of the Region's population.The average altitude is 2,200 m. Major geographic features include plains, plateaus and massifs.