Answer: msta

AnswerCrossword Clue
MSTARiver into Lake Ilmen.
MSTARiver, 270 miles, into Lake Ilmen.
MSTARiver to Lake Ilmen.
MSTARussian river
MSTAFeeder of Lake Ilmen
MSTARiver in Russia
MSTAU.S.S.R. river
MSTARiver into Lake Ilmen