Ecuadorian–Peruvian territorial dispute

The Ecuadorian–Peruvian territorial dispute was a territorial dispute between Ecuador and Peru, which, until 1928, also included Colombia. The dispute had its origins on each country's interpretation of what Real Cedulas Spain used to precisely define its colonial territories in the Americas. After independence, all of Spain's colonial territories signed and agreed to proclaim their limits in the basis of the principle of uti possidetis juris, which regarded the Spanish borders of 1810 as the borders of the new republics. However, conflicting claims and disagreements between the newly formed countries eventually escalated to the point of armed conflicts on several occasions.

The dispute de jure had come to an end in the aftermath of the Ecuadorian–Peruvian War with the signing of the Rio de Janeiro Protocol on January 29, 1942. However, this treaty was also questioned, and the two countries went to war on two more occasions: the Paquisha War in 1981, and the Cenepa War in 1995. Tensions subsided but persisted over the next three years. On October 26, 1998, Ecuador and Peru signed a comprehensive peace accord that established a framework for ending a border dispute. Formal demarcation of border regions started on May 13, 1999. The agreement was ratified without opposition by the congresses of both nations, finally bringing a definitive end to the dispute.