Ireibaru is a major archaeological site of Okinawa Island, located in town of Chatan on the western coast. It includes occupations for the whole duration of the Kaizuka period, for the Gusuku and Early Kingdom periods, the early modern period and the modern period. It is the only site in Okinawa Prefecture to show occupations for each of the phases of the Kaizuka period. It yielded large quantities of artefacts in perishable materials conserved in wet context. It has been designated as a National Historic Site in 2010. Chatan Museum opened on 20 November 2024 at the location of the site.