On day three of the journey down Gifu’s Nagara River area, we took a short 20-minute drive from Mino to Seki, a town known for making blades of all kinds.
Like in towns further up the river, craftsmen in Seki relied on merchant boats to send their products around the country, but the Nagara River was also key in the production of metal. Two major ingredients needed to make a Japanese sword are iron sand and high-quality charcoal. Charcoal made from pine burns at high temperatures and is perfect for use in the forge. The Nagara River irrigates the pine tree forests in the nearby mountains and collects the iron sand that accumulates as the river erodes the landscape. Blacksmiths in Seki then collected iron sand from its shores. There are also many stages in the sword making process that require pristine water, especially in the many steps of polishing a sword.