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Tosa (土佐郡, Tosa-gun) is a district located in Kōchi Prefecture, Japan.

As of the January 1, 2005 merger but with 2003 population estimates, the district has an estimated population of 5,348 and a density of 17.4 persons per km². The total area is 307.39 km².

• Tosa
• Ōkawa

• On October 1, 2004, the village of Hongawa, along with the village of Gohoku, from Agawa District, merged into the expanded town of Ino, in Agawa District.
• On January 1, 2005, the villages of Kagami and Tosayama merged into the expanded city of Kōchi.

33°45′50″N 133°27′43″E / 33.764°N 133.462°E / 33.764; 133.462

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