Relationship between Penghu Stone Weirs and the Natural Environment with Chronological Study Along Taiwan's coasts, stone weirs are commonly seen, with the highest concentration found in the Penghu Islands, where there are over 600, mostly along the northern and eastern coasts of Jibei Island. These stone weirs not only reflect the fishing ingenuity and construction techniques of early settlers but are also closely connected to their fishing economy, kinship organization, and religious culture. For this reason, they are considered an important part of underwater cultural heritage, attracting many scholars to study them. However, the historical context of stone weirs—particularly their individual dating and evolution—remains underexplored due to the difficulty of accurately dating these structures.