Akagane means "copper" and os eritten "銅" in kanji.
Long time ago, people used horses to carry copper from Ashio to Gunma.
After that, they transported it by ships on the Tone River to Edo.
The Akagane Road was a land route used in order to transport copper.This road was not like roads today, in fact, it was only wide enough for the horse-carts to pass.
The copper transported via this route was used make the roots of "The Toshogu", "The Kaneiji Temple" and " The Edo Castle" and so on. In addition to this, the copper was transported to Nagasaki and sold to merchants from Netherlands and China.