The most considerable rivers of Tuscany south of the Arno are the Cecina, which flows through the plain below Volterra, and the Ombrone, which rises in the hills near Siena, and enters the sea about 12 m.
(I) Montecatini in Val di Cecina, in the province of Pisa, 5 m.
MAREMMA (a corruption of Marittima, " situated on the sea"), a marshy region of Tuscany, Italy, extending from the mouth of the Cecina to Orbetello and varying in breadth from 15 to 20 m.
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