The most important were the Ulai or Eulaeus (Kuran) with its tributary the Pasitigris, the Choaspes (Kerkhah), the Coprates (river of Diz called in the inscriptions), the Hedyphon or Hedypnus (Jerrahi), and the Croatis (Hindyan), besides the monumental Surappi and Ukni, perhaps to be identified with the Hedyphon and Oroatis, which fell into the sea in the marshy region at the mouth of the Tigris.
On an isolated rock between the town and the river stands a ruined castle, the Diz-i-siyah (black castle), the residence of the governor of the district (then called Samha) in the middle ages, and, with some modern additions, one of them consisting of rooms on the summit, called Felek ul aflak (heaven of heavens), the residence of the governors of Luristan in the beginning of the 19th century.
And more, and in it are the sources of Persia's most important rivers, as the Zayendeh-rud, Jarahi, Karun, Diz, Abi, Kerkheh.
DIZFUL, or DIZ-PUL ("fort-bridge"), a town of Persia, in the province of Arabistan, 36 m.
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