Stopped for lunch at the Piscina Restaurant, very nice little town. Free Aire water and waste, not the most attractive but very good for a stop.
Area de Castellar
https://www.campercontact.com/en/spanje/andalucia-04-11-14-18-21-23-29-41-/castellar-de-la-frontera/19908/area-de-castellar
