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> . }
Which river's mouth location is Laptev Sea and also Arctic Ocean?
SELECT DISTINCT ?b WHERE { ?b property:mouth_location resource:Arctic_Ocean . . ?b property:mouth_location resource:Laptev_Sea }
Lena River
[Lena River] has mouth location Laptev Sea and Arctic Ocean.
[Lena river] has estuaries in the Black Sea and the Arctic Ocean.