SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/mouthMountain> <http://dbpedia.org/resource/Old_Saybrook,_Connecticut> }
Which rivers end in Old Saybrook, Connecticut?
SELECT DISTINCT ?h WHERE { ?h property:mouth_mountain resource:Old_Saybrook,_Connecticut }
Connecticut River
The river whose mouth mountain is in Old Saybrook, Connecticut is [Connecticut River].
The river whose mouth is in Old Seybrook, Connecticut, [the Connecticut River].