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The Katase is an approximately 3-kilometer-long segment of the river from Kawana (川名), Fujisawa, where the Sakai River (境川) and Kashio River join, to a point at Enoshima Island, where the river flows into Sagami Bay.
Kōza District was one of the ancient subdivisions of Sagami Province, extending from Sagami Bay north to the border of Musashi Province between the Sagami River and the Sakai River.