Often it happens to get confused when talking about Bonarda because its meaning depends on where you are, an attitude also very common in Italy.
In the best case scenario - in the province of Pavia, in Lombardy - we can drink Bonarda dell'Oltrepò Pavese DOC, a red wine produced with Croatina grapes for at least 85%. This grape is also present in other more or less known wines, such as Gutturnio DOC or Colli Piacentini Rosso DOC.
Less well known are the Bonarda grapes, which have no connection either with the aforementioned Croatina, or with the Uva rara (in North Piedmont called Bonarda novarese or Bonarda di Gattinara). It is cultivated in Piedmont and is used mostly in combination with other grapes; in purity we find it in the denomination Piemonte Bonarda DOC.