Hoshigatō obsidian mine site

Hoshigatō obsidian mine site - Credit: Wikimedia Commons

The is a Jōmon period archaeological site consisting 193 shallow interconnected pits over a 35,000 square meter area, from which obsidian had been mined, located in what is now part of the town of Nagawa in the Chūbu region Japan. It has been protected as a National Historic Site since 2015. Read more on Wikipedia

type: ancient site
date from: Jōmon period

Source: en.wikipedia.org