Guidebook to walking in the mountains of Ronda and Grazalema in AndalucÃÂa, southern Spain. The 32 graded routes range from 4 to 16km and explore the Natural Parks of Grazalema and La Sierra de las Nieves, the 'Pueblos Blancos' (White Villages) perched high in the mountains, and the Genal and Guadiaro river valleys.