Södertörn
Södertörn is a roughly triangular peninsula and artificial island in eastern Södermanland , Sweden , which is bordered by: 
<triplet> Södertörn <subj> peninsula <obj> instance of <subj> Sweden <obj> country <triplet> Södermanland <subj> Sweden <obj> country <triplet> Sweden <subj> Södermanland <obj> has part