Name of Monument:


Also known as:



Roda (Rawdah) Island in the River Nile, Cairo, Egypt

Date of Monument:

Hegira 247 / AD 861

Architect(s) / master-builder(s):

Ahmad ibn Muhammad al-Hasib supervised construction.

Period / Dynasty:



Caliph Al-Mutawakkil Ala Allah, (r. AH 232–47 / AD 847–61).


The Nilometer (Kiosk of the Nile; known in Arabic as al-Miqyas) is considered among the enduring architectural foundations tied to the Egyptian culture and way of life. It is in fact unique in the Islamic world. Its importance goes back to a time when measuring the rise of the waters of the Nile was closely related to the levying of taxes on agricultural lands. Taxes were levied only when the waters of the Nile had risen to a certain designated level, which would irrigate the land during flood season.
The Nilometer itself is the equivalent of a well whose walls are built from skilfully hewn stone blocks. The thickness of the walls increases the greater the depth. The well consists of three levels: the lowest level is a circular base, while the middle level is a square whose sides measure more than the diameter of the level below. The highest level is also square in shape, and bigger than the middle level. It is due to this design that the walls can bear the horizontal pressure of the earth that increases the greater the depth.
The waters of the Nile would flow into the well by means of three tunnels, which discharged their waters into the well by means of three 'mouths' on the eastern side that are in the form of subterranean entrances in the wall. These openings are oriented towards pointed arches supported by compact decorated columns with globular bases. These arches are considered to be not only the oldest known examples in Islamic Egypt, but precede the European Gothic type by three centuries. We may also view similar examples on the arches of the Ibn Tulun Mosque in Cairo (AH 265 / AD 879).
A staircase curves around the inside walls of the well and extends all the way to the bottom. Adorning the upper reaches of the well on two sides, the northern and the eastern internal walls, are inscriptions in kufic script, which represent the oldest (dated) Arabic inscription in Egypt ever recorded. In the centre of the well stands the principal component of the monument, an octagonal marble pillar whose length extends to 16 cubits (10.50 m). It is engraved with measurements in cubits (kirat) and inches (zira'), which demarcate the water inundation levels.
Ahmad ibn Tulun (r. AH 254–70 / AD 868–84) carried out restoration of al-Miqyas in AH 259 / AD 873 and replaced the two bands of ancient inscriptions with more contemporary ones on the south and west sides. He placed his name within the new inscription, but kept the original date of construction untouched. Throughout the ages the building has been subject to many restorations and renovations (Fatimid, Mamluk and Ottoman). It was renovated in the modern age in 1925 when the Mamluk dome crowning the outside of the building was replaced by a conical-shaped roof covered by lead panels.

View Short Description

Set on Roda island in the Nile, the Nilometer is a unique structure in Islamic architecture. It gained its importance from being the means for calculating tax levies on agricultural lands according to the size of the Nile flood every year. Its design and the building materials used in its construction helped it to resist corrosion by water for over one thousand years.

How Monument was dated:

Historians concur that al-Miqyas was built in the year 247 / 861 by order of the Abbassid Caliph al-Mutawakkil, although some scholars trace its foundation back to the Caliph al–Ma'mun (r. 169–217 / 786–833). However, the historian Ibn Khalkan (d. 681 / 1282) mentions that the name of the al-Mutawakkil and the year the Nilometer was constructed (247 / 861) was engraved within an inscription on the walls of the well, and that this inscription dated to the foundation of the monument. This inscription has now been lost and may have been removed when Ibn Tulun carried out his restoration of the building in the year 259 / 873.

Selected bibliography:

Allen, T., A Classical Revival in Islamic Architecture, Weisbaden, 1986.
Behrens-Abouseif, D., Islamic Architecture in Cairo: An Introduction, London and New York, 1992.
Creswell, K. A. C., Muslim Architecture of Egypt, Vol. II, Oxford, 1940.
Ghaleb Pasha, K., Le Mikyâs ou Nilomètre de l'Ile de Rodah, Cairo, 1951.
Hillenbrand, R., Islamic Art and Architecture, London, 1989.
Ibn Khalkan, Abu al-Qasim Shams al-Din Ahmad (d. 681 / 1282), Anba' al-Zaman [News of the Times], Beirut, 1968.
Popper, W., The Cairo Nilometer: Studies in Ibn Taghri Bardi's Chronicles of Egypt: I, California, 1951.
Shafi'i, F., Al-Emara al-Arabia fi Misr al-Islamiya [Arab Architecture in Islamic Egypt], Vol. I, Cairo, 1994.
Williams, C., Islamic Monuments in Cairo: A Practical Guide, Cairo, 2002.

Citation of this web page:

Tarek Torky "Nilometer" in Discover Islamic Art, Museum With No Frontiers, 2022. 2022.;ISL;eg;Mon01;1;en

Prepared by: Tarek TorkyTarek Torky

Tarek Abdel Aziz Torky holds a BA in Islamic and Coptic Antiquities from Cairo University (1982). He is currently Head of the Statistics Department at the Information Centre of the Supreme Council of Antiquities and reporter of the committee set up to prepare for the celebrations of the centennial of the Museum of Islamic Art in Cairo. As Expo Curator for the Discover Islamic Art project in Egypt he prepared the database information for the Egyptian monuments included in the project and participated in formulating the dynastic and cross-dynastic exhibitions. He has participated in the first phase of the Islamic Art in the Mediterranean project as product manager and prepared the texts and photos for the catalogue Mamluk Art: the Splendour and Magic of the Sultans (MWNF, 2001). In 2002 he obtained a scholarship for Med. Master on new technologies for valorisation and management of Mediterranean Cultural Heritage in Ravello, Salerno.

Copyedited by: Majd Musa
Translation by: Amal Sachedina (from the Arabic).
Translation copyedited by: Mandi GomezMandi Gomez

Amanda Gomez is a freelance copy-editor and proofreader working in London. She studied Art History and Literature at Essex University (1986–89) and received her MA (Area Studies Africa: Art, Literature, African Thought) from SOAS in 1990. She worked as an editorial assistant for the independent publisher Bellew Publishing (1991–94) and studied at Bookhouse and the London College of Printing on day release. She was publications officer at the Museum of London until 2000 and then took a role at Art Books International, where she worked on projects for independent publishers and arts institutions that included MWNF’s English-language editions of the books series Islamic Art in the Mediterranean. She was part of the editorial team for further MWNF iterations: Discover Islamic Art in the Mediterranean Virtual Museum and the illustrated volume Discover Islamic Art in the Mediterranean.

True to its ethos of connecting people through the arts, MWNF has provided Amanda with valuable opportunities for discovery and learning, increased her editorial experience, and connected her with publishers and institutions all over the world. More recently, the projects she has worked on include MWNF’s Sharing History Virtual Museum and Exhibition series, Vitra Design Museum’s Victor Papanek and Objects of Desire, and Haus der Kulturen der Welt’s online publication 2 or 3 Tigers and its volume Race, Nation, Class.

MWNF Working Number: ET 01


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