ASK WHERE { <http://dbpedia.org/resource/River_Shannon> <http://dbpedia.org/ontology/sourceMountain> <http://dbpedia.org/resource/Dowra> }
Does the river shannon originate from Dowra?
ASK WHERE { resource:River_Shannon property:source_mountain resource:Dowra }
Yes
[Yes], Dowra is the source mountain of river shannon.
[Yes], Dover is the origin of the Shannon River.
[Yes], Dowra is  the source mountain from where the river originates.
[Yes], Dowra is the source of the river.