What percentage of Australia's irrigation wine regions are accounted by Riverland and Riverina combined?

Riverland and Riverina are two of Australia's largest wine regions, particularly notable for their significant contributions to the country's overall wine production. Together, these regions account for a substantial percentage of the irrigation-based wine regions in Australia.

The Riverland is located in South Australia and is known for its high yields and diverse production, while the Riverina, located primarily in New South Wales, is recognized for its robust production of various wine styles, including both table wines and quality dessert wines.

Considering their size and output, together they account for about 40% of the total irrigation wine regions in Australia. This makes option B the most accurate choice in reflecting their combined influence on the country's wine industry, particularly in terms of irrigation practices. Understanding the scale of these regions is crucial for any sommelier, as it highlights the importance of these areas in the broader context of Australian viticulture and wine production.