Question: Which source of Water resources management in El Salvador is also the nation of the Sierra del Merendn?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
 SELECT DISTINCT ?uri WHERE { res:Water_resources_management_in_El_Salvador prop:sourceCountry ?uri. res:Sierra_del_Merendón onto:country ?uri}