Question: What city is located on the mouth of Duwamish River?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { res:Duwamish_River onto:riverMouth ?x . ?x prop:cities ?uri  . }