Question: What river flows through Huntsville?
Answer(s):
answer: Ohio River

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:geography.river.cities ns:m.0q8sw . 
?c ns:geography.river.mouth ?x .
}