Book excerpt: In the medieval world, geographical knowledge was influenced by religious ideas and beliefs. Whereas this point is well analysed for the Latin-Christian world, the religious character of the Arabic-Islamic geographic tradition has not yet been scrutinised in detail. This volume addresses this desideratum and combines case studies from both traditions of geographic thinking. The contributions comprise in-depth analyses of individual geographical works as for example those of al-Idrisi or Lambert of Saint-Omer, different forms of presenting geographical knowledge such as TO-diagrams or globes as well as performative aspects of studying and meditating geographical knowledge. Focussing on texts as well as on maps, the contributions open up a comparative perspective on how religious knowledge influenced the way the world and its geography were perceived and described int the medieval world.