Colombian President Gustavo Petro has accused Peru of unilaterally annexing the disputed Amazonian island of Santa Rosa, reigniting a century-old territorial dispute. Petro claims Peru's recent congressional vote designating Santa Rosa as a district violates past treaties and could block Colombian city Leticia’s access to the Amazon River. Colombia argues the island emerged after the 1922 and 1929 treaties and lies on its side of the river. Peru defends its actions as legal and necessary for governance. Colombia vows diplomatic action, with Petro planning Independence Day celebrations in Leticia to assert sovereignty over the region and challenge Peru's territorial claims.