March 2007 Sumatra earthquakes
The March 2007 Sumatra earthquakes occurred near the northern end of Lake Singkarak in Sumatra , Indonesia , on March 6 . 
<triplet> March 2007 Sumatra earthquakes <subj> Indonesia <obj> country <triplet> Lake Singkarak <subj> Indonesia <obj> country <triplet> Sumatra <subj> Indonesia <obj> country