Book excerpt: Where is dār al-islām, and who defines its boundaries in the 21st century? In Dār al-Islām Revisited. Territoriality in Contemporary Islamic Legal Discourse on Muslims in the West, Sarah Albrecht explores the variety of ways in which contemporary Sunni Muslim scholars, intellectuals, and activists reinterpret the Islamic legal tradition of dividing the world into dār al-islām, the “territory of Islam,” dār al-ḥarb, the “territory of war,” and other geo-religious categories. Starting with an overview of the rich history of debate about this tradition, this book traces how and why territorial boundaries have remained a matter of controversy until today. It shows that they play a crucial role in current discussions of religious authority, identity, and the interpretation of the shariʿa in the West.