Map of the Abbasid Caliphate at the end of the reign of al-Mu'tamid in 891-892. Dark green denotes provinces under the effective control of the central government; light green denotes provinces under the control of autonomous governors or rebels.
The core Abbasid territories include Shahrazur, Darabadh, al-Samaghan, Hulwan, Masabadhan, Mihrijanqadhaq, the Euphrates districts, and Qarqisiyya (al-Tabari v. 37, p. 98; Bianquis p. 96). 
Map originally created as an .SVG file in Inkscape and converted to .PNG for size reasons.
Background topography taken from DEMIS Mapserver, which are public domain.
Works Cited:

Baloch, N.A., and A.Q. Rafiqi. "The regions of Sind, Baluchistan, Multan and Kashmir: the historical, social and economic setting." History of Civilizations of Central Asia, Volume IV: The Age of Achievement: AD 750 to the End of the Fifteenth Century. 
Barthold, W. Turkestan Down to the Mongol Invasion. Trans. V. Minorskey. Taipei: Southern Materials Center, 1988.
Bianquis, Thierry. "Autonomous Egypt from ibn Tulun to Kafur, 868-969." The Cambridge History of Egypt, Volume 1: Islamic Egypt, 640-1517. Ed Carl F. Petry. Cambridge, UK: Cambridge University Press, 1998. 0-521-47137-0
Bosworh, C.E. "The City of Tarsus and the Arab-Byzantine Frontiers in Early and Middle 'Abbasid Times." Oriens, Vol. 33, 1992, pp. 268-286.
-------The History of the Saffarids of Sistan and the Maliks of Nimruz (247/861 to 949/1542-3). Costa Mesa, California: Mazda Publishers, 1994. ISBN 1-56859-015-6
Bregel, Yuri. An Historical Atlas of Central Asia. Leiden and Boston: Brill, 2003. ISBN 90-04-12321-0
Encyclopaedia Iranica. Vol. I-. London, 1982-.
The Encyclopaedia of Islam. New Ed. 12 vols. with supplement and indices. Leiden: E.J. Brill, 1960-2005. (for most of the localities on the map)
"Europe in the Year 900." Euratlas. Accessed 3 December 2017.
Frye, Richard N. The Cambridge History of Iran, Vol. 4: The Period from the Arab Invasion to the Saljuqs. Cambridge: Cambridge University Press, 1975. ISBN 978-0-521-20093-6 (text and maps)
Hamdani, Abbas. "History of Surt." Excavations at Surt (Medinat al-Sultan) between 1977 and 1981. Ed. Elizabeth Savage. London: Department of Antiquities, 2002.
Kennedy, Hugh, ed. An Historical Atlas of Islam. Boston: Brill Academic, 2002. ISBN 90-04-12235-4
Le Strange, Guy. The Lands of the Eastern Caliphate: Mesopotamia, Persia, and Central Asia, from the Moslem conquest to the time of Timur. Cambridge: Cambridge University Press, 1905.
"Maps." Armenica. Accessed 3 December 2017.
Al-Muqaddasi, Muhammad ibn Ahmad. The Best Divisions for Knowledge of the Regions. Trans. Basil Collins. Reading: Garner Publishing Limited, 2001. ISBN 1-85964-136-9
Al-Tabari, Abu Ja'far Muhammad ibn Jarir. The History of al-Tabari, Volume XXXVII: The 'Abbasid Recovery. Trans. Philip M. Fields. Ed. Ehsan Yar-Shater. Albany, NY: State University of New York Press, 1985. ISBN 0-88706-054-4
-------The History of al-Tabari, Volume XXXVIII: The Return of the Caliphate to Baghdad. Trans. Franz Rosenthal. Ed. Ehsan Yar-Shater. Albany, NY: State University of New York Press, 1985. ISBN 0-87395-876-4
Ter-Ghewondyan, Aram. The Arab Emirates in Bagratid Armenia. Trans. Nina G. Garsoïan. Lisbon: Livraria Bertrand, 1976.
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Ro4444, rowanwindwhistler