Guidebook to walking the GR221 Drystone Route (Ruta de Pedra en Sec) traversing Mallorca's Serra de Tramuntana between Pollen¿a and Andratx. Following rock, paved paths and mule tracks between welcoming villages, the 140km (87 mile) trek is in 10 day stages and showcases the island's forests, mountains and drystone structures.