SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/countySeat> <http://dbpedia.org/resource/Heathsville,_Virginia> . ?uri <http://dbpedia.org/property/mouthLocation> ?x . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
Which river starts from the county seat of Heathsville, Virginia?
SELECT DISTINCT ?l WHERE { ?l rdf:type ontology:River . ?a property:county_seat resource:Heathsville,_Virginia . ?l property:mouth_location ?a }
Potomac River
[Potomac River] starts from the county seat of Heathsville, Virginia.
[The Potomac River] originates in the city of Asheville, Virginia.