This native of the north-eastern part of the Beiras (the northern sector of DOC Beira Interior) has yet to escape the region.

It is rare to see a single-variety Fonte Cal – most is blended – but the variety produces big, well-structured wines that are floral, honeyed and fruity, but often sadly low in acidity, and over-high in alcohol. In the vineyard, Fonte Cal is a late-ripening, moderately productive variety, vigorous and leafy, with medium-sized bunches of tightly-packed greenish-yellow grapes.