According to "Shugaisho (an ancient encyclopedia in 14c)," the total area of rice fields and vegetable fields for the whole of Japan was one million chobu (approximately, 99,174 square kilometer), but in "Keicho nihonzu hensan (the compilation of the map of Japan in the Keicho era)"in the Keicho era it was 1.6 million chobu (approximately, 158,978 square kilometer).
『拾芥抄』によれば100万町歩とされた全国の田畑面積が、慶長年間の慶長日本図編纂においては160万町歩であったとされている。