- Warburn Estate is the 8th largest winery in Australia and is currently run by the 3rd and 4th generation. Today, it is over 50 years that Giuseppe and Antonio Sergi became pioneer winemakers in the Riverina district and the family strives to continue their hard work and passion of making wine and most of all to support future generations here at Warburn Estate. - Warburn Estate, doubtless drawn in part by the success of Casella's yellowtail, has seen its production soar. It draws on 1000ha of vineyards, and produces an encyclopaedic range of wines exported to all major markets, including UK and US.