Note 4 — Chapter I
Reading edition
According to Ibn Rusta (quoted by Le Strange, "Journ. Roy. Asiat. Soc.," 1905, p. 301), in Sassanian times, and before the bursting of the dykes which led to the formation of the swamps, the Tigris followed the same eastern channel in which it flows at the present time; this account is confirmed by Yâkût.