Caves of the Jaspe and the Tocino Nature · Arevalillo de Cega, Comunidad de Villa y Tierra de Pedraza, Segovia Image of Arevalillo de Cega, not of the place itself. In the north-eastern sector of the municipal district, beside the river Cega, open the caves known as del Jaspe and del Tocino, shelters inhabited in the Bronze Age and today part of the rocky landscape of the canyon. Photo: Malopez 21 (CC BY-SA 4.0) What to see and do in Arevalillo de Cega