After being a pilot track in 2005, GeoCLEF advanced to be a regular track within CLEF 2006. The\ud purpose of GeoCLEF is to test and evaluate cross-language geographic information retrieval (GIR): retrieval for\ud topics with a geographic specification. For GeoCLEF 2006, twenty-five search topics were defined by the\ud organizing groups for searching English, German, Portuguese and Spanish document collections. Topics were\ud translated into English, German, Portuguese, Spanish and Japanese. Several topics in 2006 were significantly\ud more geographically challenging than in 2005. Seventeen groups submitted 149 runs (up from eleven groups and\ud 117 runs in GeoCLEF 2005). The groups used a variety of approaches, including geographic bounding boxes,\ud named entity extraction and external knowledge bases (geographic thesauri and ontologies and gazetteers)
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