Towards the end of the Edo era into the beginning of the Meiji... there had been a number of active coalfields developed... near the Toga River in the Chikuho district in Kyushu... and as a result, this area rapidly became vigorous. ###>Entre la fin de l'ère Edo et le début de l'ère Meiji, des bassins houillers extrêmement rentables furent exploités le long du fleuve Onga, dans la région de Chikuho, sur l'île de Kyushu.