Shio no Michi (塩の道, Salt Road) was an old kaidō, or road, in ancient Japan and was used to transport salt from the ocean to the inland central Honshū. In the Middle Ages, salt was brought both from the Sea of Japan and the Pacific Ocean to Shinano Province for processing. The road leading from the Sea of Japan to Shinano Province was called the Chikuni Kaidō (千国街道), whereas the road leading from the Pacific Ocean was called the Sanshū Kaidō (三州街道).