Sillen
It straddles the boundary between Gnesta Municipality in Södermanland County and Södertälje Municipality in Stockholm County . 
<triplet> Gnesta Municipality <subj> Södermanland County <obj> located in the administrative territorial entity <subj> Södertälje Municipality <obj> shares border with <triplet> Södermanland County <subj> Gnesta Municipality <obj> contains administrative territorial entity <subj> Stockholm County <obj> shares border with <triplet> Södertälje Municipality <subj> Gnesta Municipality <obj> shares border with <subj> Stockholm County <obj> located in the administrative territorial entity <triplet> Stockholm County <subj> Södermanland County <obj> shares border with <subj> Södertälje Municipality <obj> contains administrative territorial entity