The Timavo River, known in Slovene as the Timava or Timav, is a 2-km river in the Province of Trieste. It has four sources near San Giovanni (Slovene: Štivan) near Duino (Slovene: Devin) and outflows in the Gulf of Panzano (part of the Gulf of Trieste) between Trieste and Monfalcone (Slovene: Tržič), Italy.
The river has a karst character. The hypothesis that it is solely the continuation of the Reka River (Slovenia) was refuted in the 20th century. The Timavo receives one-third of water from the Reka and two-thirds from the Vipava and Soča rivers and from precipitation from the Karst Plateau.
The Roman authors Livy, Strabo, and Virgil mention the river. Virgil wrote that nine streams emerge from a mountain to form the river.[1] A Roman settlement near the sources was called Fons Timavi.