Ownership of each agricultural area was organized at the time of enlargement and improvement of agricultural areas in plains, but there was no such organization in the case of Tanada, so the ownership relationships of Tanada, which look uninterrupted to outsiders, are quite complex and the area cultivated by each household is small.
平野の圃場大型化整備の際に行われた田圃の所有権の整理が棚田ではされていないため、外部の者が一体的な風景に見える棚田の所有権はかなり複雑に入り組んでおり、1世帯あたりの耕作面積も少ない。