Abstract: The query language described and discussed here is designed for a geographical information system. The basic map data structure is object-oriented, homo-geneous and raster-based. Because of the homogeneous map data structure queries can be applied in a more or less generic way, that is, queries can be applied to all map data structures regardless of their type. Furthermore, the query language design is based on a visual interaction technique, which gives a simpler structure compared to conventional query languages.