The Vipava (in Slovene) or Vipacco (in Italian) or Wipbach / Wippach (in German) is a river that flows through western Slovenia and northeast Italy. The river is 44 km in length but including minor tributaries extends some 49 km. After entering Italy it joins the Isonzo/Soča in the Municipality of Savogna d'Isonzo. The Battle of the Frigidus was fought near the river, which was named Frigidus ('cold') by the Romans.
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