Vulsini
Vulsini , also known as Volsini volcano , Vulsini Volcanic District , Vulsini Volcanic Complex and the Vulsinian District , is a circular region of intrusive igneous rock in Lazio , Italy , about to the north northwest of Rome , containing a cluster of calderas known to have been active in recent geologic and historical times . 
<triplet> Lazio <subj> Italy <obj> country <triplet> Italy <subj> Lazio <obj> contains administrative territorial entity