SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/owner> <http://dbpedia.org/resource/Zambezi_River_Authority> . ?x <http://dbpedia.org/ontology/river> ?uri . }
On which river are there things belonging to zambezi river authority?
SELECT DISTINCT ?i WHERE { ?w property:river ?i . . ?w property:owner resource:Zambezi_River_Authority }
Zambezi
The river of the things owned by Zambezi River Authority is [Zambezi].
The river of things flowing into the Zambezi River is [Zambezi].