 They were developed at the areas occupied by the Celts in the Douro valley and in Galicia.Examples include Las Cogotas, in Ávila, the Castro of Santa Tecla, in Pontevedra in Spain.In Portugal these include Citânia de Briteiros in Braga, Citânia de St Luzia in Viana do Castelo and Sanfins in Paços de Ferreira.