Question: Name the river with source country in Zambia and source region as North-Western Province, Zambia?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/sourceCountry> <http://dbpedia.org/resource/Zambia> . ?uri <http://dbpedia.org/ontology/sourceRegion> <http://dbpedia.org/resource/North-Western_Province,_Zambia>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}