Little is known about the life of Abū Isḥāq Ibrāhīm b. Muḥammad al-Iṣṭakhrī, the author of Kitāb al-Masālik wa l-mamālik, which was written towards the end of the first half of the 10th century CE. The work built on the earlier concept of the “atlas of Islam”, which it developed further. The climates (iqlīm) it describes are no longer those of Ptolemean geography, but, reflecting the Iranian tradition, refer to geographical entities or “countries”. Also reflecting the author’s background—whose most common nisba is al-Fārisī—Iran holds a favoured position on this work. Published in 1870, the present edition by M.J. de Goeje was the first volume in the first series of the Bibliotheca Geographorum Arabicorum.