Which of the following is NOT a part of the North Coast AVA?

Riverside County is not part of the North Coast AVA, which comprises counties known for their cooler coastal climates and a focus on high-quality wine production. The North Coast AVA primarily includes Lake County, Sonoma County, and Mendocino County, all of which are located in northern California and are recognized for their distinct viticultural characteristics influenced by the Pacific Ocean's proximity.

Lake County, with its volcanic soils and high elevation, Sonoma County, known for its diverse microclimates and varietals, and Mendocino County, celebrated for its organic and sustainable practices, all contribute significantly to California's wine industry within the North Coast region. In contrast, Riverside County is located inland and is generally considered part of the Southern California wine region, which has different climatic and geological conditions affecting vineyard practices. This distinction clarifies Riverside County's exclusion from the North Coast AVA.