Doberdò del Lago (Slovene: Doberdob; Bisiacco: Dobardò; Friulian: Dobardò) is a comune (municipality) in the Regional decentralization entity of Gorizia in the Italian region of Friuli-Venezia Giulia, located about 30 kilometres (19 mi) northwest of Trieste and about 11 kilometres (7 mi) southwest of Gorizia, and borders the following municipalities: Duino-Aurisina, Fogliano Redipuglia, Komen (Slovenia), Miren-Kostanjevica (Slovenia), Monfalcone, Ronchi dei Legionari, Sagrado and Savogna d'Isonzo.

Since then, the number of Slovenes has slightly fallen, mostly due to the increased immigration of Italian speakers from neighboring towns of Monfalcone and Ronchi dei Legionari.

A relatively wide and flat canyon runs right through the middle of the municipality from north to south, connecting the Vipava Valley to the Adriatic Sea.

The main road between Gorizia and Trieste runs through this canyon, which is the most direct connection between the Goriška region and the seaside.

At its southern edge, the Dol Canyon widens into a typical karst polje, dominated by Lake Doberdò.

On the east side of the Dol Canyon rises the plateau known as the Trieste and Komen Karst (tržaško-komenski Kras), which continues eastward and southward into neighboring Slovenia.

[4] Dol Canyon ends in the narrow Timavo Valley, which is already located in the neighboring municipality of Duino.

During World War II, the Communist-lead Liberation Front of the Slovenian People organized anti-Fascist resistance in the area starting from late 1942.

In May 2009, a chapel commemorating the Hungarian victims of the Battles of the Isonzo was inaugurated in the hamlet of Visintini (Slovene: Vižintini) with a trilingual, Italian-Hungarian-Slovene inscription.