Question: Which rivers start from the Provinces of Zambia?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/settlementType> <http://dbpedia.org/resource/Provinces_of_Zambia> . ?uri <http://dbpedia.org/ontology/sourceRegion> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}