What is {coordinate location} of {Mekong River} that is {applies to part} is {river mouth} ?
coordinates of Mekong River  north?
What is coordinate location of Mekong River that is applies to part of river mouth ?
SELECT ?q WHERE { ?l property:applies_to_part resource:river_mouth . resource:Mekong_River property:coordinate_location ?l . ?l property:coordinate_location ?q }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q41179> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P625> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P518> <http://wikidata.dbpedia.org/resource/Q1233637>
} 

SELECT ?obj WHERE { wd:Q41179 p:P625 ?s . ?s ps:P625 ?obj . ?s pq:P518 wd:Q1233637 }