This volume of Religion and Society is marked by borders, boundaries, and limits. The borders here are those that make religion operative and politically powerful, as well as those that are enabled and put into place by religious arguments and worldviews. All these dimensions of borders are included in the special section of this volume, coordinated by Valentina Napolitano and Nurit Stadler, entitled “Borderlands and Religion: Materialities, Histories, and the Spatialization of State Sovereignty.” The section includes articles by Alejandro Lugo, Nurit Stadler and Nimrod Luz, Alberto Hernández and Amalia Campos-Delgado, and Alexander D. M. Henley. They dwell upon two of the most notorious and contentious borders in the world: the one that separates Lebanon and Palestine from Israel, and the one that separates the US from Mexico. Both Israel and the US are known for their fenced and walled frontier politics. From these contributions, we learn how borderlands and their religious framing become spaces of political negotiation by affirmation and/or by exclusion: they determine sovereignty, ontology, history.