Cailloux is the French name for a natural wine that has less than 13% alcohol.
The French term cailloux refers to stones or large pebbles often left behind by ancient rivers or glaciers. Although it can seem next to impossible, vineyards exist in soils composed mainly of such stones. Several regions in Europe are notable for cailloux (especially Châteauneuf-du-Pape). In the US a region famous for its cailloux is the Rocks District of Milton Freewater, an appellation in rural eastern Oregon that is across the border from the town of Walla Walla, Washington. Some of the best Syrah in the U.S, grows here in cailloux.