Picadas gorge Nature · Navas del Rey, Sierra Oeste, Madrid A narrowing of the Alberche valley covered with stone pine and Scots pine mixed with holm oaks, junipers and wild olives; in the pine woods of the northern half of the district, specimens more than two hundred years old survive. Photo: Asqueladd (CC BY-SA 4.0) What to see and do in Navas del Rey