Question: Name the river with mouth place Essex and source place as Gloucestershire ?
SPARQL query: SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/mouthPlace> <http://dbpedia.org/resource/Essex> . ?uri <http://dbpedia.org/ontology/sourcePlace> <http://dbpedia.org/resource/Gloucestershire>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
Answer: [River Thames] is the river with the mouth in Essex and source in Gloucestershire.