Kaisō (海草郡, Kaisō-gun) is a district located in Wakayama Prefecture, Japan.
As of September 1, 2008, the district has an estimated population of 10,988 and a density of 85.6 inhabitants per square kilometre (222/sq mi). The total area is 128.31 square kilometres (49.54 sq mi).
34°09′14″N 135°23′35″E / 34.154°N 135.393°E / 34.154; 135.393
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