Virolahti (Finnish: [ˈʋiroˌlɑhti]; Swedish: Vederlax) is the southeasternmost municipality of Finland on the border of Russia.

The Vaalimaa border crossing, which connects the municipality with Russia, is located in Virolahti.

[6][7] A small part of Virolahti was ceded by Sweden to Russia in the Treaty of Uusikaupunki in 1721.

Virolahti lost some of its area (over 100 km2 (39 sq mi)) to Soviet Union in Paris Peace Treaties, 1947, after World War II.

Villages marked with an asterisk (*) are now completely or partially on the Russian side: Alapihlaja, Alaurpala*, Eerikkälä, Hailila, Hanski, Hellä (Heligby), Hämeenkylä (Tavastby), Häppilä, Järvenkylä, Kattilainen, Kiiskilahti* (now Kiyskinlakhti), Kirkonkylä, Klamila, Koivuniemi, Koskela*, Koskelanjoki, Kotola, Kurkela, Laitsalmi*, Länsikylä (Flonckarböle), Martinsaari* (Now Island of Maly Pogranichny), Mattila, Mustamaa, Nopala, Orslahti* (now Primorskoye), Paatio* (Båtö in Swedish, now Bolshoy Pogranitshny), Pajulahti, Pajusaari*, Pitkäpaasi* (Island of Gorniya Kamenya), Pyterlahti, Ravijoki, Ravijärvi, Reinikkala, Rännänen (Grennäs), Sydänkylä (Kallfjärd), Säkäjärvi, Tiilikkala, Vaalimaa (Vaderma), Vilkkilä, Virojoki, Yläpihlaja, Yläurpala* (now Torfjanovka).