Сирет
The Danube river is considered the "life-blood" of Galați. The Danube is the second longest river in Europe ), with an average flow of per second in the Galați section. After the Siret River, the largest tributary in Romania, joins the Danube, the flow is . After the Prut River joins the Danube, the flow becomes . The Danube river flows have significant seasonal variation. The maximum flows occur in May; . The minimum flows occur during the summer; .