Lagoons of the Carrizal and the Tenca Nature · Lastras de Cuéllar, Tierra de Pinares, Segovia Image of Lastras de Cuéllar, not of the place itself. Two wetlands of special ecological interest dot the municipal district, among pinewoods and banks of the Cega peopled with willows and birches; they are scarce and valuable water points in a sandy landscape that drains rapidly. Photo: Pacific Museum of Earth from Canada (CC BY-SA 2.0) What to see and do in Lastras de Cuéllar