Rawalpindi in the context of "D-Chowk (Islamabad)"

The Islamabad–Rawalpindi metropolitan area, commonly referred to as Islamabad–Rawalpindi or the Twin Cities, is the fourth-largest metropolitan area of Pakistan, after Karachi, Lahore, and Faisalabad. With a population of over 5.7 million, it is the third-most populous metropolitan area in the Punjab region, the largest in northern Punjab, and fourth 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.

Islamabad (/ɪzˈlɑːməbæd/ ; Urdu: اسلام‌آباد, romanised: Islāmābād, lit. 'City of Islam', [ɪsˈlɑːmɑːbɑːd] ) is the capital city of Pakistan. It is the country's tenth-most populous city with a population of over 1.1 million, and is federally administered by the Pakistani government as part of the Islamabad Capital Territory. Built as a planned city in the 1960s and established in 1967, it replaced Karachi as Pakistan's national capital. Islamabad is located north of the city of Rawalpindi, with which it forms a metropolitan area of over 5.7 million inhabitants.

The Greek architect Constantinos Apostolou Doxiadis developed Islamabad's master plan, in which he divided it into eight zones; the city comprises administrative, diplomatic enclave, residential areas, educational and industrial sectors, commercial areas, as well as rural and green areas administered by the Islamabad Metropolitan Corporation with support from the Capital Development Authority. Islamabad is known for its parks and forests, including the Margalla Hills National Park and the Shakarparian. It is home to several landmarks, including the country's flagship Faisal Mosque. Other prominent landmarks include the Pakistan Monument and Democracy Square.

Punjab (/pʌnˈdʒɑːb/ pun-JAHB; Punjabi: Panjāb, pronounced [pəɲˈd͡ʒaːb] ) is a geographical, ethnolinguistic, and historical region in South Asia, located in its northwestern part, comprising areas of modern-day Pakistan and northwestern India. It is primarily inhabited by the Punjabi people. Lahore is its largest city and historic capital, with other major cities including Faisalabad, Rawalpindi, Gujranwala, Multan, Sialkot, Sargodha, and Bahawalpur in Pakistan; alongside Ludhiana, Amritsar, Chandigarh, Jalandhar, Patiala, Mohali, Bathinda, Firozpur, and Fazilka in India.

Punjab grew out of the settlements along the five rivers, which served as an important route to the Near East as early as the ancient Indus Valley civilization, dating back to 3000 BCE, followed by migrations of the Indo-Aryan peoples. Agriculture has been the chief economic feature of the Punjab and formed the foundation of Punjabi culture. The Punjab emerged as an important agricultural region, especially following the Green Revolution during the mid-1960s to the mid-1970s, and has been described as the "breadbasket of both India and Pakistan."

Punjab (/pʌnˈdʒɑːb/ pun-JAHB; Punjabi, Urdu: پنجاب, pronounced [pəɲˈd͡ʒaːb] ) is a province of Pakistan. With a population of over 127 million, it is the most populous province in Pakistan and the second most populous subnational polity in the world. Located in the central-eastern region of the country, it has the largest economy, contributing the most to national GDP in Pakistan. Lahore is the capital and largest city of the province. Other major cities include Faisalabad, Rawalpindi, Gujranwala and Multan.

It is bordered by the Pakistani provinces of Khyber Pakhtunkhwa to the north-west, Balochistan to the south-west and Sindh to the south, as well as Islamabad Capital Territory to the north-west and Azad Kashmir to the north. It shares an international border with the Indian states of Rajasthan and Punjab to the east and Indian-administered Kashmir to the north-east. Punjab is the most fertile province of the country as the Indus River and its four major tributaries Ravi, Jhelum, Chenab, and Sutlej flow through it.

Rawalpindi District (Punjabi and Urdu: ضِلع راولپِنڈى) 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.

The district has an area of 5,286 km (2,041 sq mi). Originally, its area was 6,192 km (2,391 sq mi) until the 1960s when Islamabad Capital Territory was carved out of the district, giving away an area of 906 km (350 sq mi). It is situated on the southern slopes of the north-western extremities of the Himalayas, including large mountain tracts with rich valleys traversed by mountain rivers. The chief rivers are the Indus and the Jhelum, and it is noted for its milder climate and abundant rainfall due to its proximity to the foothills.