Which wine region is noted for its production being 99% red with some rosé, and is associated with notable producer Halos de Jupiter?

The wine region noted for producing 99% red wines, with some rosé, is indeed Gigondas. This region is part of the Southern Rhône and is well-known for its high-quality red wines, which are primarily made from Grenache, often blended with Mourvèdre and Syrah. The climate and soil of Gigondas contribute to the full-bodied and robust characteristics of its red wines.

Notable producers in the region, such as Halos de Jupiter, enhance the reputation of Gigondas by producing wines that reflect the terroir and traditional winemaking practices. This focus on red wine production, with only a small percentage allocated to rosé, reinforces Gigondas' identity as a predominantly red wine region. The strong emphasis on red varietals and the successful producers therein, such as Halos de Jupiter, are key elements that define Gigondas in the broader context of French wine regions.