version of the Zamyad Yasht consists of two parts. The first part is a fragment of eight sections (Yt. 19.1-8) containing a list of 40 mountains. Despite its geographical character, the list is interpreted to represent mythology rather than geography. The second, much longer part is the Kayan Yasn, dedicated to the Khvarenah (, 'glory') of the Kayanian dynasty. This glory is first bestowed by Ahura Mazda upon the Pishdadian dynasty, the mythical predecessors of the Kayanian dynasty. Yet after the downfall of Yima, they lose the glory which then becomes unseized or unappropriated (). In search of a legitimate holder, the glory finally reaches the Kansayoya sea. At this point, the Yasht provides a detailed description of the hydrography of the Sistan Basin, in particular of Hāmūn-e Helmand: Apart from the Helmand River, these verses contain the names of eight other rivers flowing into lake Hamun; namely the Khvastra (, 'good pasture'), the Huvaspa (, 'good horse'), the Fradata (, 'wealthy'), the Khvarenanguhaiti (), the Ushtavaiti (), the Urva (, 'liquid'), the Erezi (), and the Zurenumaiti (). None of these names relate directly to known Sistani rivers but a number of studies have tried to establish such connections. These attempts rely on parallels in Pahlavi literature like the Bundahishn and the Tarikh-i Sistan, where a number of Sistani rivers are mentioned. Further features of Sistani geography recur in the same verses, like the Kansayoya sea or Mount Ushada, both of which are closely connected to Zoroastrian eschatology. Together with the description in the Vendidad, these passages make Sistan the best described region in the Avesta. Conclusion A comparison of the first chapter of the Vendidad with the passages of geographical interest in the great Yashts shows that the geographical area of interest for the people of the Avesta was centered around the Hindu Kush range. To the north, it included Sogdiana, Bactria, Aria, Margiana and Chorasmia; an area later known as Greater Khorasan under the Sassanians. To the south, it included Arachosia, Drangiana, Gandara and the upper Punjab up to the Indus river; an area known as Ariana, the land of the Arya, to the Greeks. This strong focus on Eastern Iran has also implication for the time of composition of the text. Starting with the rise of the Achaemenid Empire, the political focus of the Iranian world shifted decidedly to the West. The near-total absence of western