Kasai is a district located in Tokachi Subprefecture, Hokkaido, Japan. As of 2004, the district has an estimated population of 25,474 and a density of 25.91 persons per km². The total area is 983.05 km².
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"The family-run vegetable farm in the Kasai-gun region grows eight types of crops, including daikon, cabbage, and edamame. However, its star crop is undoubtedly the yama wasabi, or mountain horseradish, which stands out for its mellow sweet flavor and slightly bitter aftertaste." - Kenneth Goh