In recent years, web sites have evolved from simple collections of static content to suppliers of complex services to users. This evolution has allowed users to benefit from various customized services according to his needs. Currently many services are geographically-aware and they have localized features but do not communicate with systems that are complementary from a geographic of functional perspectives. However, the geographic extensity is a natural dimension on which simple services can be integrated into complex ones. This integration requires a container to provide a common and unifying view of the territory. A GIS with topological information is the ideal mapping for services that pertain to a given territory. Integration provides a way to create new services through reusing services that provide only a subset of functionality that could be used in very different integrated services. This paper analyzes the integration issues of localized services using a GIS.