Question: Which river flows through both eastern and central washington?
SPARQL query: SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Eastern_Washington> <http://dbpedia.org/ontology/river> ?uri. <http://dbpedia.org/resource/Central_Washington> <http://dbpedia.org/ontology/river> ?uri . }
Answer: The river which flows on both eastern and central Washington is [Columbia River].