Shimane Prefecture in Japan’s Chūgoku region. Population around 690k; small, historic coastline and heritage sites. In the news for Tatara tradition and charcoal craft linked to Harzköhlerei Stemberghaus in Germany.
A tatara furnace yields a 1-meter, 120-kilogram kera bloom after 24 hours of labor, containing tamahagane steel prized by swordsmiths. The result is assessed by subjective judgments of flame color and air flow. The process demands patience as the bloom cools and is sorted into grades.