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Yamagata is located in the southern portion of the Yamagata Basin in southeast Yamagata Prefecture. The northern and northwestern parts of the city are flatland, and the eastern part of the city is occupied by the Ōu Mountains. The city includes Mount Zaō within its borders. The Mamigasaki River passes through the city, and the Tachiyagawa River forms the border between Yamagata and Tendō.