The Sieve is a river in Italy. It is a tributary of the Arno, into which it flows at Pontassieve after a course of 62km. The Sieve rises in the Tuscan-Emilian Apennines, near the Futa Pass, at 930m of elevation.

The territory in which it flows is known in Italian as Valdisieve. In the Italian language, the name "Sieve" is feminine, and is therefore referred to as La Sieve.

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