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Upa (river)
The
Upa
is a
river
in
Tula Oblast
,
Russia
, and one of the main
tributaries
of the
Oka
.
The river
is long, and has a
drainage basin
of.
The city
of
Tula
is
situated
on its
banks
. The name of
the river
is of
Baltic
origin
.