Segregación de Frontera Historical milestone · Frontera, El Hierro, Santa Cruz de Tenerife Image of Frontera, not of the place itself. The municipality of Frontera broke away from Valverde in 1920, taking the name of the Valle de El Golfo, by which it had been known. 1920 Photo: Victor R. Ruiz from Arinaga, Canary Islands, Spain (CC BY-SA 2.0) What to see and do in Frontera