PhenomenOntology is a topographic ontology that contains geographic features present in Spanish territory. This ontology has been developed by the Ontology Engineering Group (OEG) in collaboration with the Spanish National Geographic Institute (IGN). PhenomenOntology development is based on different heterogeneous geospatial information resources pertaining to IGN, such as: Concise Gazetteer, Spanish National Geographic Nomenclature, Numerical Cartographic Base 1:200.000, Numerical Cartographical  Base 1:25,000 and Numerical Topographical Base 1:25.000.