 Pliocene sediments exposed in the northwest of the Granada basin were washed down by the Cacín from the Alpujarride reliefs of the Almijara/Tejeda.The mountains have highest rainfall in December, January and March, and lowest in July.According to the Resource Management Plan (Decree 145/199 of the Junta de Andalucía) annual rainfall ranges from in Cacín, Almuñécar and Nerja to in Arenas del Rey.