Restinga da Marambaia
It is 42 km long and separates Sepetiba Bay from the Atlantic Ocean , being a part of the municipalities of Rio de Janeiro , Itaguaí and Mangaratiba . 
<triplet> Rio de Janeiro <subj> municipalities <obj> instance of <subj> Itaguaí <obj> shares border with <triplet> Itaguaí <subj> municipalities <obj> instance of <subj> Rio de Janeiro <obj> shares border with <triplet> Mangaratiba <subj> municipalities <obj> instance of