SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/property/sourceLocation> <http://dbpedia.org/resource/Dowra> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
What river is it whose source is Dowra?
SELECT DISTINCT ?r WHERE { ?r property:source_location resource:Dowra . ?r rdf:type ontology:River }
River Shannon
The river with source location in Dowra is [River Shannon].
The upstream river at Doura [Shannon River].