The total area of the county is 5,476 sq. Km. The county is situated on a plain between the Siret River and the Prut River. Also, the river Jijia crosses the county, and the city of Iasi is on the banks of its tributary, Bahluia. The southern part is occupied by the hills of the Central Moldavian Plateau, with altitudes of over 400 meters, and the northern part is occupied by the Plain of Moldavia. In the west, the county is crossed by the Siret Corridor and the last fragments of Falticeni Plateau and also by the Great Hill, with altitudes over 500 meters.
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