Geographically, the governorates of Jordan are located in one of three regions: the North Region, Central Region and the South Region. These three geographical regions are not distributed by area or populations, but rather by geographical connectivity and distance among the population centers. The South Region is separated from the Central Region by the Mountains of Moab in Karak Governorate. The population centers of the Central and North Region are separated geographically by the mountains of Jerash Governorate. Socially, the population centers of Amman, Salt, Zarqa and Madaba form together one large metropolitan area in which business interactions in these cities are under the influence of Amman. While the cities of Jerash, Ajloun, and Mafraq are mostly under the influence of the city of Irbid.