Chile Digs Trenches on Peru Border Five Days Into Kast Era

Chile border wall construction began Monday as President José Antonio Kast traveled to the country’s northern frontier to personally oversee the first excavation works of what his government calls the most ambitious border security project in Chilean history. Just five days into his presidency, Kast inspected a line of military excavators digging three-meter-deep trenches at the Chacalluta crossing on the Peru border, launching the Plan Escudo Fronterizo that was the centerpiece of his election campaign. The Rio Times, the Latin American financial news outlet, examines how the security initiative is reshaping border dynamics and regional diplomacy across South America’s southern cone.

Chile Border Wall: Scale and Technology

The plan envisions barriers stretching 520 kilometers from Chacalluta, on the 169-kilometer Peru border, south through the regions of Tarapacá and Antofagasta to the Colchane crossing point near Bolivia. The system combines physical barriers — trenches three meters deep and walls up to five meters high — with electrified perimeter fencing, motion sensors, thermal radar towers, and autonomous drones equipped with facial recognition, infrared, and thermal cameras operating around the clock. Some 3,000 military and police personnel will maintain permanent rotating presence along the frontier.

Kast emphasized that the barrier is part of an integrated system, not just a ditch. From the military base at Solo de Zaldívar, he told assembled troops and officials that organized crime and illegal immigration “don’t recognize borders” and that Chile’s response must be coordinated with Bolivia, Peru, and Argentina. The government also plans to propose legislation criminalizing irregular migration and punishing landlords and employers who facilitate the stay of undocumented migrants, as well as establishing a 10-kilometer exclusion zone along the border where anyone without documentation would face immediate detention and deportation.

Regional Reactions and the Funnel Effect

Peru has responded with its own security buildup. The Peruvian government declared a state of emergency in the Tacna region and deployed specialized police units and military forces to the border area, anticipating that the Chile border wall could create an accumulation of stranded migrants on the Peruvian side. Peruvian Foreign Minister Hugo de Zela said Lima respects Chilean sovereignty but is monitoring the construction closely and has proposed a binational working group for joint surveillance, information sharing, and electronic detection of irregular crossings.

The migration pressure that prompted the project is substantial. Chile hosts an estimated 729,000 Venezuelans, with more than 252,000 lacking regular status as of 2024. The previous government under Gabriel Boric struggled to manage flows through the same northern corridors that Kast now intends to seal with physical barriers. Chile’s Defense Minister Fernando Barros said any deportations would not be directed toward Peru, and that the government’s policy is to maintain good relations with neighboring countries. Political scientist Alejandro Mejia of Lima’s San Marcos University noted that migration became “the cornerstone of the campaign that brought Kast to the presidency” and that the plan reflects pragmatism in addressing what has become one of Chile’s most sensitive public policy challenges. The construction is financed with state funds managed by the army and the Ministry of Public Works, though no official cost estimate has been disclosed. Whether the infrastructure succeeds in reducing crossings or simply redirects them — and at what humanitarian cost — will be the central test of a project that Kast has staked his early presidency on delivering.