The Treaty of Lisbon is a treaty on the borders of Spain and Portugal from the mouth of the Minho River to the junction of the Caia River with the Guadiana River. Signed in Lisbon on 29 September 1864, it abolished the Couto Misto microstate.
The final act of approving annexes to the treaty was signed at Lisbon on 4 November 1866.
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The Portugal–Spain border, also referred to as "the Stripe", is one of the oldest geopolitical borders in the world. The current demarcation is almost identical to that defined in 1297 by the Treaty of Alcañices. The Portugal–Spain border is 1,234 km (767 mi) long, and is the longest uninterrupted border within the European Union, being free of border control since March 26, 1995 (the effective date of the Schengen Agreement), with a few temporary exceptions, such as in the 2020 lockdown caused by the COVID-19 pandemic.
The Treaty of Limits between Portugal and Spain was signed in Lisbon in 1864 and ratified in Madrid in 1866, leaving unsettled a southern stretch because of the Olivenza and the Moura strifes. A 1926 Convention of Limits ratified the southern end of the border, incorporating a 1893 agreement concerning Moura, while the lands of Olivenza were left without demarcation because of Portuguese reluctance to recognise Spanish sovereignty over the territory.
Couto Misto (Portuguese: Couto Misto [ˈkotu ˈmiʃtu]; Galician: Couto Mixto; Spanish: Coto Mixto) was an independent microstate on the border between Spain and Portugal. It comprised the villages of Santiago de Rubiás, Rubiás (now in the Spanish municipality of Calvos de Randín), and Meaus (now in the Spanish municipality of Baltar), all in the Salas Valley, Ourense, Galicia. The territory of the Couto Misto also included a small uninhabited strip now part of the Portuguese municipality of Montalegre.
As a result of complex medieval manorial relations, this land eluded both Portuguese and Spanish control for centuries, actually operating as a sovereign state in its own right until the 1864 Treaty of Lisbon that partitioned the territory between Spain (which annexed most of the land including the three villages) and Portugal (which remained with a smaller uninhabited strip of land). As a de facto independent country, the inhabitants of the Couto Misto had many privileges, including exemption from military service and taxes, and could grant asylum to outsiders and deny access to any foreign military contingent.