The way points of this running / walking route:
From Ronda drive on A376 direction Sevilla. Turn left into A372 to Grazalema. Turn right into the small forest road and park your car immediatelly on the meadow. Walk on the forest road around the mountains to the lake of Zahara.
Turn left into the small paved road between two fences
You enter the mainroad to zahara. Don't buy at the 'Molino' . It's too expensive.
Climb onto the castle on the hill and enjoy the view over the lake of Zahara. Return on the same way to Grazalema (another 15 km !)