Osyotr
The Osyotr is a river in Tula and Moscow Oblasts in Russia , a right tributary of the Oka . 
<triplet> Osyotr <subj> river <obj> instance of <subj> Tula <obj> located in the administrative territorial entity <subj> Oka <obj> mouth of the watercourse <triplet> Tula <subj> Moscow Oblast <obj> shares border with <subj> Russia <obj> country <triplet> Moscow Oblast <subj> Russia <obj> country <triplet> Russia <subj> Tula <obj> contains administrative territorial entity <subj> Moscow Oblast <obj> contains administrative territorial entity <triplet> Oka <subj> Osyotr <obj> tributary <subj> river <obj> instance of <subj> Russia <obj> basin country