This study aims to develop digital cultural heritage content based on augmented reality (AR) and the metaverse, focusing on nine nationally designated scenic sites in Jeju Island, Korea. These natural monuments are not only significant for their geological and ecological value but also for their rich narrative context, which has been preserved in old maps, classical poetry, travelogues, and folklore. By collecting and analyzing traditional textual resources and geospatial data, the study proposes a multi-layered AR content design strategy, categorized into location-based, image-based, and scenario-driven types. Building on this, a metaverse integration model is presented that combines digital twin reproduction with imaginative reconstruction to offer a narrative-driven immersive experience. The results of this study suggest that AR and metaverse technologies can transform place-based narratives into interactive cultural experiences, offering new pathways for the preservation, interpretation, education, and promotion of natural and cultural heritage. Furthermore, this research contributes to the growing field of digital humanities by proposing a framework that integrates traditional narratives with immersive technologies. The findings have broader implications for the digital transformation of regional heritage and present a replicable model for applying immersive storytelling to other culturally significant landscapes.