SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/riverMouth> <http://dbpedia.org/resource/Clatsop_County,_Oregon> . ?uri <http://dbpedia.org/ontology/source> <http://dbpedia.org/resource/Columbia_Lake> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
Name the river with source as Columbia Lake and river mouth is located in Clatsop Country ?
SELECT DISTINCT ?b WHERE { ?b rdf:type ontology:River . ?b property:source resource:Columbia_Lake . ?b property:river_mouth resource:Clatsop_County,_Oregon }
Columbia River
[Columbia River] is the river whose mouth is in Clatsop County and source in Columbia Lake.
[The Columbia River] is a river whose mouth is in Clatsop County and its source is in Lake Columbia.