Question: Name a  river with source country as Zambia and source location as Ikelenge  District?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/sourceCountry> <http://dbpedia.org/resource/Zambia> . ?uri <http://dbpedia.org/property/sourceLocation> <http://dbpedia.org/resource/Ikelenge_District>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}