Silverboom is a wine brand that is associated with the Swartland wine region in South Africa. The Swartland is located in the Western Cape province and is known for its diverse terroir and quality wine production. In the context of Silverboom, it is likely that they produce wines sourced from vineyards within the Swartland region. The specific varietals and styles of wine produced by Silverboom may vary, as they may offer a range of options such as red, white, or rosé wines.