Portugal–Spain border NATO 2010 Lisbon summit and during Pope Francis's visit to Fátima in May 2017. Portugal's maritime borders, also known as the Exclusive economic zone of Portugal is currently disputed by Spain in the Savage Islands area, between Madeira and the Canary Islands. The main crossing point between Portugal and Spain is Vilar Formoso - Fuentes de Oñoro. Other important crossings are Caminha and Bragança to Galicia, Portalegre and Elvas to Badajoz, and Castro Marim and Vila Real de Santo António to Ayamonte. Bridges across the border include the Guadiana International Bridge and the Lower Guadiana International bridge. A zipline across
Portuguese nationality law as the "Estado da Índia" this territory was an integral part of Portugal (as distinct from a colony) under Portugal's Constitution of 1910. On 19 December 1961 India invaded and annexed the territory. The annexation was not recognised by Portugal until 1975, at which time Portugal re-established diplomatic relations with India. The recognition of Indian sovereignty over Portuguese India was backdated to 19 December 1961. Portuguese nationality law allows those who were Portuguese citizens connected with Portuguese India before 1961 to retain Portuguese nationality. Acquisition of Indian citizenship was determined to be non-voluntary at the time. One practical obstacle is