The goal of this paper is to present concepts concerning geographic ontologies and especially the use spatial relations. It is showed that spatial topological relations (Egenhofer) are not sufficient to model reality such as road and mountains. Finally, a primer list of adapted topological relations is given. In this paper, the concept of ontology is presented and more exactly the concepts of geographic ontology. Those ontologies model not only conventional geographic features with their semantic relations, but also with spatial relations which exist between those features. The aim of this paper will be to identify those spatial relations, to show how to use them for modelling and manipulating geographic ontologies. As an example, Fig. 1 gives a small ontology for natural disasters with only two relations, “is-a” and “implies” modelling causalities between some natural disasters.