Question: Name the river  whose source location is Nevado Mismi and region is Arequipa Region?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/property/sourceLocation> <http://dbpedia.org/resource/Nevado_Mismi> . ?uri <http://dbpedia.org/property/sourceRegion> <http://dbpedia.org/resource/Arequipa_Region> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}