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The Semantic Network Service (SNS) of the Federal Environment Agency provides support for all questions concerning environmental terms including the common place names. SNS contains a bi-lingual (German/English) semantic network which consists of three components: * the Environmental Thesaurus UMTHES® with more than 50,000 inter-networked terms. (Descriptors and Non-Descriptors). * the Geo-Thesaurus-Environment (GTU) with more than 25,000 geographic names and the spatial intersections of all these places. * an Environmental Chronology containing more than 600 contemporary and historical events that affected the environment.