YSA is a general thesaurus in Finnish which covers all fields of research and knowledge, which contains the most common terms and geographical names used in content description.


YSA is a tool for providing index terms for printed and electronic materials as well as subject-based information retrieval. The thesaurus works as a shared language between information depositaries and searchers, which improves the ease of finding information.

User interface


Data downloads
RDF serializations: Turtle and RDF/XML
Linked Data, Finto REST API

Content type
Controlled vocabulary (thesaurus)
Data status
Primary source

Ca 33 000 concepts

Update frequency
Frozen since 2019, replaced by YSO and YSO Places.

Linked to Allärs, YSO and YSO places.

External information

YSA - General Finnish Thesaurus description on National Library of Finland web site

Avoindata.fi description

BARTOC description

Wikidata item

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