Within a large tobacco region there may be areas with recognised specialisations. Habanos highlights San Juan y Martínez, in Vuelta Abajo, for its connection with growing leaves for filler and binder.

The distinction matters because it places the agricultural origin alongside the function of the material. A leaf destined for the interior and another selected to wrap the bunch are described by the role they will play during manufacture.

Here geography relates to the inner construction. Filler and binder have a less visible function than the wrapper, but they form the core and hold the bunch together. Studying their provenance draws attention back to those leaves that remain hidden when we look at the finished piece.