Question: On which river are there things belonging to zambezi river authority?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x prop:owner res:Zambezi_River_Authority . ?x onto:river ?uri  . }