Initially Zoyakumen kei shoen were regarded as the cases that were seen mainly in kinai region (provinces surrounding Kyoto and Nara), but thanks to Keiichi KUDO's research on the cases in Kyushu, it is now believed that such cases were seen across the nation.
当初は畿内を中心にした概念と考えられていたが、後に九州の事例を研究した工藤敬一らによって日本全国的な事象として考えられるようになった。