Old Chichibu Okan Highway

This is the road connecting Mushashi-no-kuni and Kai-no-kuni, and it is counted as one of the ancient “Kai Kusuji” roads. It passes through Chichibu, and beyond the Karisaka Pass which is one of the three hardest passes in Japan and heads to Koshu. It is roughly the same as the current National Route 140. You can still find some traces of it in Chichibu such as the “Tochimoto-no-seki Ruins,” ruin of checkpoints for travelers that was designated as a nationally historic site.