Islamabad–Rawalpindi

The Islamabad–Rawalpindi metropolitan area, commonly referred to as Islamabad–Rawalpindi or the Twin Cities, is the third-largest metropolitan area of Pakistan, after Karachi, and Lahore. With a population of over 5.7 million, it is the second-most populous metropolitan area in the Punjab region, the largest in northern Punjab, and third in the entire country. It consists of the twin cities of Islamabad and Rawalpindi; administratively within the Islamabad Capital Territory and the province of Punjab.

The area includes the Pothohar Plateau in northern Punjab, with and the colonial-era city of Rawalpindi, as well as the modern planned city of Islamabad. The region received a major boom with the construction of Islamabad as the capital city of Pakistan in the 1960s.