SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/sourceMountain> <http://dbpedia.org/resource/Brower's_Spring> }
Which rivers start at the Brower's Spring?
SELECT DISTINCT ?a WHERE { ?a property:source_mountain resource:Brower's_Spring }
Missouri River
The river whose source mountain is at the Brower's Spring is [Missouri River].
The river whose source is at Brewer Spring [the Missouri River].
[Missouri River] is the river whose source mountain is Brower's Spring.
[The Missouri River] is a river which starts at Brower's Spring.