Shrines were a regular component of ceremonial architecture in the public plazas of Postclassic Maya centers. Small shrines and natural landmarks such as caves and outcrops at the borders of settlements or in wilderness locations also served, and in some cases continue to serve, as important ritual loci for Maya peoples. These more peripheral locales were not only critical access points to the supernatural, but also served to delineate places. Because these border features, which represent only a given moment in a constantly shifting social and political landscape, are sometimes unmodified or are inconspicuous, they are relatively ephemeral and difficult to identify in the archaeological record. This paper documents a Late Postclassic shrine paired with a natural feature, a small hill, from the site of Tayasal in Petén, Guatemala. We argue that it served as a border shrine. Paired with the small hill, the two embodied a liminal frontier, not only between earthly and spiritual realms but also between settled and unsettled space.