Question: Which river's mouth location is Laptev Sea and also Arctic Ocean?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?uri <http://dbpedia.org/property/mouthLocation> <http://dbpedia.org/resource/Laptev_Sea> . ?uri <http://dbpedia.org/property/mouthLocation> <http://dbpedia.org/resource/Arctic_Ocean> . }
Answer: [Lena River] has mouth location Laptev Sea and Arctic Ocean.