Sakata is located in the coastal plains of the northwest corner of Yamagata Prefecture, bordered by the Sea of Japan to the west, and by Akita Prefecture to the north. The Mogami River runs through the city, which has Mount Chōkai on its northern border. The inhabited island of Tobishima, approximately off the coast of the mainland, is within the administrative borders of the city. The island, as well as part of the mainland portion of the city, is within the borders of the Chōkai Quasi-National Park