Contents: Section 1: The Geographical Concepts: Boundaries in Arabo-Islamic Cartography; and Boundaries in the Arabo-Islamic Geographic and Historical Texts; Section 2: Travelers’ Experiences at Internal Boundaries, the Area Concept in Arabo-Islamic Geography, and the Relation of Zone-Boundaries to Basic Tenets of Arabo-Islamic Culture; Boundaries in the Writings of Travelers in the Islamic Empire; The Concept of Area in Muslim Geographic Thought; and Boundary Characteristics as a Consequence of Embedded Attidues of the Culture: Section 3: Genesis of Boundary Zones Involving non-Arab Muslim States; Section 4: Summary and Conclusions. Illustrations. A reprint of the American Philosophical Society Transactions 85-6 (1985)