This travelogue about the northern provinces of Persia by Grigorij Melgunof from 1868 is freely available in our open access collection MENAdoc.
Melgunof was a Russian researcher, geographer and member of the German Oriental Society (DMG).
According to Melgunof’s foreword the illustration shows: “die Karte des Khazarischen Meeres, mit erklärendem Texte, aus dem persischen Werke des Nasir-eddin Tusi, nach einer Handschrift der Wiener Hofbibliothek, mit deutscher Uebersetzung”. (The map of the Khazar Sea, with explanatory texts, from the Persian works of Nasir al-Din al-Tusi, after a manuscript of the Imperial Court Library Vienna, with German translation).
According to modern map standards, the Caspian Sea is upside down here. The Volga is flowing in the wrong direction.