A wall in the Andes: Why Chile wants to fortify its border with Bolivia

The plan, promoted by Chilean president José Antonio Kast, calls for the construction of physical barriers along parts of the Chile–Bolivia border in an effort to curb irregular migration and strengthen border security. While the proposal has sparked heated debate in both countries, it also reflects a wider global trend in which governments are increasingly turning to fortified borders to respond to migration pressures.

The growing pressure on Chile’s northern border

Over the past several years, Chile’s northern frontier has become one of the main migration routes into the country. Thousands of migrants, many travelling from Venezuela, Haiti and other parts of Latin America, have crossed through Bolivia before entering Chile via remote border points in the Andean plateau.

For Kast’s government, the situation represents a serious challenge to national security and state capacity. Officials argue that irregular crossings are linked not only to humanitarian migration but also to organised crime networks, including human trafficking, smuggling and drug transport routes operating across the Andean region.

The proposed border measures, therefore, go beyond a simple wall. The plan includes trenches, high fencing, electronic surveillance systems, drones and an expanded military presence along vulnerable sections of the frontier.

A difficult border to control

The border between Chile and Bolivia runs for roughly 860 kilometres across one of the most inhospitable landscapes in the world. Much of it cuts through high-altitude desert terrain in the Atacama Desert, where temperatures fluctuate dramatically, and infrastructure is scarce.

Policing such terrain has always been difficult. Even today, large sections of the frontier remain largely unmonitored.

For critics, this raises doubts about the practical effectiveness of building walls in such an environment. They argue that migration routes tend to adapt quickly to new barriers, often shifting to more remote or dangerous paths.

Regional and diplomatic implications

The proposal has also generated discussion in Bolivia, where some officials and analysts worry about the potential diplomatic impact of a heavily fortified border.

Relations between the two countries have long been shaped by historical tensions dating back to the War of the Pacific, which left Bolivia landlocked after losing its coastline to Chile.

Although trade and cross-border movement have continued in the decades since, the idea of a physical barrier raises concerns about the future dynamics of mobility and cooperation in the region.

At the same time, migration across the Andes is rarely a purely bilateral issue. Many migrants travelling through Bolivia have already crossed several countries before reaching Chile, making the phenomenon part of a much broader regional migration system.