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formed by the upper course of the river until its confluence with the Maestro della Chiana channel.
*The Val di Chiana, a plain drained in the 18th century, which until then had been a marshy area tributary of the Tiber.
*The upper Valdarno, a long valley bordered on the east by the Pratomagno massif and on the west by the hills around Siena.
*The Sieve's basin, which flows into the Arno immediately

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