Puemo is a highly regarded sub-appellation of the Cachapoal Valley. Following the corridor formed by the Cachapoal River, it is inland from the cool Pacific Ocean, allowing for more moderate temperatures than the coast. Its elevation and proximity to the high peaks of the Andes mean that there are huge diurnal temperature drops in the evenings to ensure acid balance. Most of the rains fall during the cool winter months, with frequent periods of drought during the extended growing season.