The Islamabad–Rawalpindi metropolitan area is the fourth-largest metropolitan area of Pakistan, after Karachi, Lahore, and Faisalabad. It consists of the twin cities of Islamabad and Rawalpindi.
Rawalpindi District is a district located in the northernmost part of the Punjab province of Pakistan. Parts of the district form part of the Islamabad Rawalpindi metropolitan area. Rawalpindi city is the district capital.