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GeoNames Semantic Web

The GeoNames Ontology makes it possible to add geospatial semantic information to the Word Wide Web. All over 6.2 million geonames toponyms now have a unique URL with a...
European Nature Information System

EUNIS consists of information on species, habitat types and sites.
CTIC Public Dataset Catalogs

Overview of worldwide data catalogues.

You can also access this registry using the API (see API Docs).