Question: What is the river on which the Kariba Dam and Batoka Gorge Hydroelectirc power station exist?
SPARQL query: SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Kariba_Dam> <http://dbpedia.org/ontology/river> ?uri. <http://dbpedia.org/resource/Batoka_Gorge_Hydroelectric_Power_Station> <http://dbpedia.org/ontology/river> ?uri . }
Answer: [Zambezi] is the river of both Kariba Dam and Batoka Gorge Hydroelectric power station.