What is the fine-grained topic of the following text: It is perhaps a little known fact that our town, Montechiaro d’Asti, is not only home to the large National White Truffle Fair (the first Sunday in November), but that the "Valle Fameria" and "Valle Boriello" are also home to the largest truffle reserve in Italy: “The Big Woods" (Il Grande Bosco). Only return the topic.
The largest truffle reserve in Montechiaro d’Asti, Italy