SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/source> <http://dbpedia.org/resource/Green_River_(Duwamish_River)> . ?x <http://dbpedia.org/ontology/city> ?uri . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
Through which important cities the does the river originating from the Duwamish, flow?
SELECT DISTINCT ?y WHERE { ?a rdf:type ontology:River . ?a property:city ?y . ?a property:source resource:Green_River_(_Duwamish_River) }
Tukwila, Washington, Seattle
The river originating from the Duwamish flow through [Tukwila, Washington, Seattle].
The river starting from the Duvamish flows through [Tukwila, Washington, Seattle].