In ancient texts such as the "Wajinden", the term "hinamori" is mentioned as a crucial aspect of defending the country from external invasions. Some places in Japan still carry this name as a part of their geographical name, such as the city of Kobayashi. This city is situated on the periphery of a basin, surrounded by hills and mountains that reach heights of 300 meters above sea level. To the south of the city is the Kirishima volcano group, to the north is the Kyushu mountain range, and to the east and west are hilly areas that border the Tsukushi and Kakuto basins. Historically, this area was considered a borderland and was called Hina-mori, as mentioned in the "Engishiki" and was controlled by the Satsuma clan and the Shimazu clan in more recent times.[1]