The Ecuadorian-Peruvian War was a conflict between Ecuador and Peru that occurred from 1941 to 1942. The war was primarily over territorial disputes in the Amazon rainforest, particularly the Cenepa River region. Tensions escalated due to differing interpretations of colonial-era treaties, leading to military confrontations. The conflict ended with the signing of the Rio de Janeiro Protocol in 1942, which established a ceasefire and outlined the borders between the two nations. Despite the agreement, disputes continued for decades, culminating in further skirmishes in the late 20th century, but the war marked a significant moment in South American history.