Place & climate
- Study group: Moyenne Garonne groups Buzet, Côtes du Marmandais and Fronton for this guide. It is neither an AOP nor an official CMS regional division.
- West to east: Côtes du Marmandais surrounds Marmande on both banks of the Garonne. Buzet lies farther upstream near Agen and Buzet-sur-Baïse. Fronton is much farther east, north of Toulouse, on ancient Tarn terraces.
- Climate: Atlantic influence remains important around Marmande and Agen, with warmer southern influences and inland contrasts. Fronton combines oceanic and Mediterranean influences; the warm, drying Autan wind matters.
- Soils & relief: Marmandais and Buzet combine clay-limestone hills and gravelly terrace deposits. Fronton’s Tarn alluvia contain gravel, sand, silt and clay. These affect water supply and drainage, not a fixed flavour.