Piedra at the Oaks Reserve Piedra at the Oaks Reserve is an approximate 2,800-acre (1,133 hectares) mountainous site located in the heart of Mexico’s colonial highlands. The project is extraordinarily situated within 30 minutes of two of Mexico’s cultural jewels: San Miguel de Allende and Guanajuato, Guanajuato. Both are remarkable 16th century colonial towns protected by UNESCO as World Heritage sites. The Guanajuato International Airport is currently a 45 minute drive from Piedra and its picturesque location within the state’s second most important oak forest.