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Narva is a river that forms a natural border between Estonia and Russia. It matters because it serves as an important geographical and political boundary between these two countries.
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The Narva, formerly also Narwa or Narova, is a river in northeastern Estonia flowing 77 kilometres (48 mi) north from Lake Peipus to the Baltic Sea. It is the largest Estonian river by discharge and forms part of the Estonia–Russia border.
The river gives its name to the archaeological (Neolithic) Narva culture, as well as the city of Narva. Narva is the third most populous urban area in Estonia and faces the Russian town of Ivangorod across the river.