ASK WHERE { <http://dbpedia.org/resource/San_Marcos_River> <http://dbpedia.org/ontology/sourceMountain> <http://dbpedia.org/resource/Texas> }
Does the San Macros River start in Texas?
ASK WHERE { resource:San_Marcos_River property:source_mountain resource:Texas }
Yes
[Yes], Texas is the source of San Marcos River.
[Yes] Texas is the starting point of the San Marcos River.
[Yes], Texas is the source mountain of the river.
[Yes], Texas is the start of the river.