The chestnut, 'castagnu' in Corsican, is omnipresent in Castagniccia, this mountainous region of northeastern Corsica, which was named after it in the 17th century. The cultivation of the chestnut, which then represented 70% of the local economy, allowed its villages to live in a closed loop for a long time. It thus ensured the region a certain prosperity and a high concentration of population.