Transnistria (Moldovan: Нистрения, Nistrenia; Russian: Приднестровье, Pridnyestrov'ye; Ukrainian: Придністров'я, Prydnistrovya), formally known as the Transnistrian Moldovan Republic, and often abbreviated as the TMR; is a republic of the Soviet Union located in Southeastern Europe. One of the smallest republics of the USSR, Transnistria is mostly comprised of the area east of the Dniester River.