Coteaux du Layon Chaume AOC is a communal sub-appellation (one of seven in total) within the Coteaux du Layon AOC, in this case for the commune of Chaume. Maximum yields for the 100% Chenin Blanc wines are 30hl/ha as opposed to 35hl/ha for Coteaux du Layon AOC.

Bibliography

Oxford Companion to Wine 4th edition ed. Jancis Robinson MW and Julia Harding MW (Oxford University Press, 2015), p414.

Tom Stevenson, The Sotheby’s Wine Encyclopedia 5th Edition (Dorling Kindersley, 2011).