In Israel, the Jerusalem metropolitan area is the area encompassing the approximately one hundred square miles surrounding the Old City of Jerusalem with a population of 1,253,900. The expansion of Jerusalem under Israeli law followed its official annexation of the city in the aftermath of the 1967 Six-Day War. Greater Jerusalem is divided into three areas: the outer ring, the New City/Center, and The Historical Center/Inner Ring. The rings are mainly used as an administrative tool to incorporate, public transit, housing, and utility services under a common structure. Greater Jerusalem can be said to encompass the entire City of Jerusalem and its suburbs. It is the second largest metropolitan area in Israel, behind Gush Dan.