Mucutá River
The river is on the island of Marajó to the northwest of Belém in the delta region where the Amazon and Tocantins rivers empty into the Atlantic Ocean . 
<triplet> Marajó <subj> Amazon <obj> located in or next to body of water <triplet> Amazon <subj> Atlantic Ocean <obj> mouth of the watercourse <triplet> Atlantic Ocean <subj> Amazon <obj> tributary