The La Tomasa pool Nature · Navas de Riofrío, Alfoz de Segovia, Segovia On the river Peces, at the foot of the Guadarrama, opens this pool considered a spot of great natural value; the municipal district is also crossed by the Cañada de la Vera de la Sierra, one of the branches of mountain transhumance. Photo: Arturo Francisco Barbero (CC BY-SA 4.0) What to see and do in Navas de Riofrío