SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/mouthMountain> <http://dbpedia.org/resource/Southend-on-Sea> . ?uri <http://dbpedia.org/ontology/mouthPlace> <http://dbpedia.org/resource/Essex> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
Name the river whose mouth mountain is Southend-on-Sea and mouth place is Essex?
SELECT DISTINCT ?l WHERE { ?l property:mouth_place resource:Essex . ?l rdf:type ontology:River . ?l property:mouth_mountain resource:Southend-on-_Sea }
River Thames
The river whose mouth mountain is Southend-on-Sea and mouth place is Essex is [River Thames].
River with Southend-on-Sea estuary and Essex estuary, [River Tams].