The riverside groves of the Duero at San Esteban Nature · San Esteban de Gormaz, Tierras del Burgo, Soria Image of San Esteban de Gormaz, not of the place itself. The Duero widens here into a flood plain of riverside groves, poplar stands and willows at the foot of the hills crowned by the wall. The river corridor serves as a refuge for the otter and as a passage for water birds on migration. Photo: Rowanwindwhistler (CC BY-SA 3.0) What to see and do in San Esteban de Gormaz