Tamar–Tavy Estuary
The Tamar–Tavy Estuary is a Site of Special Scientific Interest ( SSSI ) covering the tidal estuaries of the River Tamar and the River Tavy on the border between Cornwall and Devon in England , UK . 
<triplet> Tamar–Tavy Estuary <subj> Site of Special Scientific Interest <obj> heritage designation <subj> estuaries <obj> instance of <triplet> River Tamar <subj> River Tavy <obj> tributary <triplet> River Tavy <subj> River Tamar <obj> mouth of the watercourse <triplet> Devon <subj> Cornwall <obj> shares border with