The thousand-year-old chestnut trees of the Alcobilla Nature · San Justo, Sanabria, Zamora Image of San Justo, not of the place itself. The more than two hundred chestnut trees that surround the hermitage are, according to estimates, between nine hundred and twelve hundred years old, one of the oldest soutos preserved in the north-west of the peninsula. Photo: Sanabria85 (CC BY-SA 3.0) What to see and do in San Justo