Shiudeyama Site, Archaeological site on Mount Shiudeyama summit, Mitoyo, Japan.

The Shiudeyama Site occupies the summit of Mount Shiudeyama, a 352-meter peak on the Misaki Peninsula in Mitoyo, Kagawa Prefecture. Excavations uncovered a mid- to late-Yayoi period settlement with pit dwellings, a raised-floor storehouse, and, in 2016, a large pillar-supported building. The site is now an archaeological park with a museum and a reconstructed pit dwelling.

The site began in the early middle Yayoi period and grew in size and population toward the late middle Yayoi, then ended abruptly. Pottery was found during landscaping in April 1947, and excavations led by Kobayashi Yukio ran from 1955 to 1957. In 1988 a circular pit dwelling and a raised-floor building were uncovered; a large pillar-supported building followed in 2016.

The on-site museum displays pottery, stone and bone tools, and weapons that show what daily life was like for the ancient residents. The types of objects found reveal the craftsmanship and trade networks that were important to this early settlement.

The site is an archaeological park near the 352-meter summit of Mt. Shiudeyama, with a museum and a reconstructed pit dwelling. Paths follow hilly terrain, so wear sturdy shoes. The summit area also has observation decks overlooking the Hiuchi Gulf of the Seto Inland Sea.

In 1988, excavation for the site museum uncovered a circular pit dwelling 2.8 by 3.2 metres and a raised-floor storehouse 2.5 metres square. Their layout closely matches the Songguk-ri site in Korea, a comparison that has shaped debate about links across the sea.