The Spanish–Portuguese treaty of 1750 or Treaty of Madrid was a document signed in the Spanish capital by Ferdinand VI of Spain and John V of Portugal on 13 January 1750. The agreement aimed to end armed conflict over a border dispute between the Spanish and Portuguese empires in South America in the vicinity of the Uruguay River, an area known as the Banda Oriental (now comprising parts of Uruguay, Argentina and the state of Rio Grande do Sul, Brazil). The treaty established borders between the Spanish and Portuguese empires, ceding much of what is today's Brazil to the Portuguese.