Landscape maps are a technique for visualizing enterprise architectures. They present architectural elements in the form of an easy to understand 2D 'map'. A landscape map view on architectures provides non-technical stakeholders, such as managers, with a high-level overview, without burdening them with technicalities of architectural drawings. In this paper we discuss the use of and techniques for landscape maps. A formal model for landscape maps is introduced as the basis of visualization and interaction techniques. Moreover, we show how a landscape map can be generated from its underlying model. Finally we show several interaction techniques, for example to build a landscape map from scratch, independently of an underlying model, or to change a landscape map together with its underlying model.