The Sierra Maestra is Cuba's largest mountain range located in the Santiago de Cuba province. A great diversity of unusually colorful birdlife is encountered in Sierra Maestra, including pygmy owls, as well as thumbnail-sized frogs, and an assortment of life forms that exist only in Cuba, such as butterflies with invisible wings. Much of the Sierra Maestra remains wild and untamed and offers some incredible hiking opportunities. The town of El Cobre, located in a high valley within the mountain range, features a shrine to Cuba's patron saint Our Lady of Charity (La Virgen de la Caridad del Cobre).