The Maya archaeological site of Ucanal is located in Peten, Guatemala, close to the contemporary border with Belize. In pre-Columbian times, the site also sat at the frontiers of some of the largest political centers, Naranjo in Peten, Guatemala, and Caracol, in Belize. Entangled between these dominant centers and with ties to peoples in the Upper Belize Valley, the Petexbatun region in Guatemala, northern Yucatan, and elsewhere, Ucanal was a critical convergence zone of political and cultural interaction. This paper synthesizes archaeological research by the Proyecto Arqueológico Ucanal to underscore the ways in which this provincial polity, identified epigraphically as K'anwitznal, maneuvered within and between different cultural affiliations and political networks. We find that the site's role as a political frontier during the Late Classic period was more of a bridge than an edge. During the later Terminal Classic period, the K'anwitznal kingdom gained independence, but continued to serve as a critical convergence of influences and interaction spheres from throughout the Maya area and beyond.