Question: Name the river whose source mountain is Baikal Mountains and mouth location is Arctic Ocean?
SPARQL query: SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/sourceMountain> <http://dbpedia.org/resource/Baikal_Mountains> . ?uri <http://dbpedia.org/property/mouthLocation> <http://dbpedia.org/resource/Arctic_Ocean>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
Answer: [Lena River] is the river whose source mountain is Baikal Mountains and mouth location is Arctic Ocean.