Capitals of caliphates

Istanbul is the largest city in Turkey, constituting the country's economic, cultural, and historical center. With a population of over 15 million, it is home to 18% of the population of Turkey. Istanbul is among the largest cities in Europe and in the world by population. It is a city on two continents; about two-thirds of its population live in Europe and the rest in Asia. Istanbul straddles the Bosphorus – one of the world's busiest waterways – in northwestern Turkey, between the Sea of Marmara and the Black Sea. Its area of is coterminous with Istanbul Province.

Cairo is the capital and largest city of Egypt and the Cairo Governorate. It is home to more than 9.8 million people. It is also part of the largest urban agglomeration in Africa, the Arab world, and the Middle East. The Greater Cairo metropolitan area is one of the largest in the world by population with over 22 million people. Areas of what would become Cairo were inhabited from pre-dynastic and early-dynastic ancient Egypt c. 6000 years ago, as the Giza pyramid complex and the ancient cities of Memphis and Heliopolis are today within the city.

Baghdad is the capital and largest city in Iraq. It is located on the banks of the Tigris in central Iraq. The city has an estimated population of 8 million. It ranks among the most populous and largest cities in the Middle East and the Arab world and constitutes 22% of Iraq's population. Baghdad is a primary financial and commercial center in the region.

Damascus is the capital and largest city of Syria. It is the oldest capital city in the world. Known colloquially in Syria as and dubbed, poetically, the "City of Jasmine" (), Damascus is a major cultural center of the Levant and the Arab world.

Medina, officially al-Madinah al-Munawwarah, also known as al-Madinah an-Nabawiyyah and Taybah and known in pre-Islamic times as Yathrib, is the capital and administrative centre of Medina Province in the Hejaz region of western Saudi Arabia. It is one of the oldest and most important places in Islamic history. The second holiest city in Islam, the population as of 2022 is 1,477,023, making it the fourth-most populous city in the country. Around 58.5% of the population are Saudi citizens and 41.5% are foreigners. Located at the core of the Medina Province in the western reaches of the country,

municipality in the province of Córdoba, Spain

Nishapur () or Neyshabur (, ) is a city in the Central District of Nishapur County, Razavi Khorasan province, Iran, serving as capital of both the county and the district.

Raqqa (, also ), is a city in Syria on the North bank of the Euphrates River, about east of Aleppo. It is located east of the Tabqa Dam, Syria's largest dam. The Hellenistic, Roman, and Byzantine city and bishopric Callinicum (formerly a Latin and now a Maronite Catholic titular see) was the capital of the Abbasid Caliphate between 796 and 809, under the reign of Harun al-Rashid. It was also the capital of the Islamic State from 2014 to 2017. With a population of 531,952 based on the 2021 official census, Raqqa is the sixth largest city in Syria.

Kufa ( ), also spelled Kufah, is a city in Iraq, about south of Baghdad, and northeast of Najaf. It is located on the banks of the Euphrates River. The estimated population in 2003 was 110,000.

Merv ( ; ), also known as the Merve Oasis, was a major Iranian city in Central Asia, located on the historical Silk Road, near today's Mary, Turkmenistan. Human settlements on the site of Merv existed from the 3rd millennium BC until the 18th century AD. It changed hands repeatedly throughout history. Under the Achaemenid Empire, it was the center of the satrapy of Margiana. It was subsequently ruled by Hellenistic Kings, Parthians, Sasanians, Arabs, Ghaznavids, Seljuqs, Khwarazmians and Timurids, among others.

Hdatta or Haditha ( ', '), was a historical city on the East bank of the Tigris just below its confluence with the Upper Zab. The city flourished during the Sasanian and early Islamic periods.