🇦🇷 Argentina · The Northeast
Santo Tomé is a quiet Corrientes city looking out over the Uruguay river, in the far northeast of the province, right opposite Brazilian São Borja. More than a mass destination, it's a border town, a place of mission history and of a wide river, where life runs at the slow pace of the deep Litoral. Its position makes it a natural crossing point into Brazil and a stop on the old route of the Jesuit-Guaraní settlements.
Its greatest treasure lies a few kilometers away: the ruins of the San Carlos Jesuit mission, one of the Thirty Towns of the Missions, today an evocative set of stone and brick walls among the scrub. Together with San Ignacio Miní (in Misiones) and the missions of Brazil and Paraguay, they're part of that remarkable social and religious experiment of the 17th and 18th centuries that marked the whole region.
This guide covers the essentials of Santo Tomé with a practical eye: the city and its waterfront on the Uruguay river, the San Carlos ruins, the crossing into Brazil over the international bridge and how to get around this border and mission country. A destination for anyone after history, river nature and the authentic flavor of the Corrientes Litoral.
Santo Tomé was born as a Jesuit-Guaraní mission in 1632 and was moved in 1639 to its present site on the Uruguay river, as part of the famous Thirty Towns of the Missions. After the expulsion of the Jesuits in 1767 came decline, and in 1817 the Portuguese troops of Brigadier Chagas Santos, arriving from São Borja, sacked and burned it. The city was officially refounded in 1863 by decree of governor Manuel Lagraña and grew as a border town tied to cattle, yerba mate and trade with Brazil. Nearby lie the ruins of San Carlos, another of the Thirty Towns missions. The full story is on our history page.
Read the full history ↓Founded in 1588 as San Juan de Vera de las Siete Corrientes, it is the most Guaraní and most federalist province in Argentina: cradle of chamamé, declared Intangible Cultural Heritage of Humanity, setting of the outbreak of the War of the Triple Alliance and home of the Esteros del Iberá, where the jaguar roars again after seventy years.
Read the history of Corrientes →No exact prices: a scale from $ (budget) to $$$$$ (luxury), with 2-3 options per category.
Origins, formation and what the sources say.
In 1817, the Portuguese troops of Brigadier Francisco das Chagas Santos crossed the Uruguay river from São Borja and left Santo Tomé 'reduced to ashes and rubble', according to the chronicles. Today an international bridge links those same two banks in peace, and that irony sums up how much was at stake on this border. Because the history of the Santo Tomé region is inseparable from the great experiment of the Guaraní Jesuit missions: between the early 17th and the mid-18th century, the Society of Jesus organized across the Río de la Plata basin — in territory now shared by Argentina, Paraguay and Brazil — a network of settlements known as the 'Thirty Towns of the Missions'. In them, the Jesuit missionaries gathered and evangelized thousands of Guaraní, organizing communities with their own economy, workshops, music and a distinctive social structure.
These missions were planned towns, with a church, a central square, housing, schools and craft workshops. The Guaraní learned crafts, European music, sculpture and construction, and developed remarkable farming and cattle raising, especially around yerba mate and livestock. The missions as a whole drew the attention of contemporary Europe for their organization and for the degree of autonomy the communities achieved.
Two of these missions are directly linked to present-day Santo Tomé: the Santo Tomé mission itself, which gave the city its name, and nearby San Carlos. Like many mission towns, they were founded, moved and relocated through the region's conflicts — among them the raids of the bandeirantes from São Paulo, who hunted indigenous people to enslave them — which is why their sites changed over time.
The San Carlos mission, near present-day Santo Tomé, was one of the Jesuit-Guaraní towns that reached a certain prosperity, with its church, its workshops and a Guaraní population given over to farming, livestock and crafts. Its position, in the borderland between Spanish and Portuguese crown territory, made it a witness to the conflicts that shook the missions in the 18th century.
The decisive blow came in 1767, when King Charles III of Spain ordered the expulsion of the Society of Jesus from all his dominions, the Americas included. Without the Jesuits who had organized them, the missions were left to other administrations and began a slow decline. Many Guaraní scattered, the towns lost population and the buildings started to deteriorate, be abandoned or be reused.
To that decline were added, in the 19th century, the wars and conflicts over control of the region, which finished off much of the old missions. Today, what remains of those towns are evocative ruins — such as San Carlos, with its stone and brick walls among the scrub — that recall that singular chapter of American history. The best-preserved missions in the region were declared a World Heritage Site by Unesco.
Santo Tomé itself was born as a Jesuit mission: it was founded on 13 July 1632 by the priests Luis Ernotte and Manuel Berthold beside the Yaguary river, in the Tape region, and moved on 9 July 1639 to its definitive site on the Uruguay river, fleeing a smallpox epidemic and the raids of the bandeirantes. It came to house some 1,500 guaraníes (Guaraní people) working in farming and livestock. After the expulsion of the Jesuits came decline, and the final blow arrived in 1817, when the Portuguese forces of Brigadier Francisco das Chagas Santos, coming from neighboring São Borja, sacked and burned the town. Only on 27 August 1863, by decree of the Corrientes governor Manuel Lagraña, was the city officially refounded on the foundations of the old mission, and from then on it grew tied to the work of the Corrientes countryside: cattle, yerba mate and, later, forestry.
Being a border town shaped its character. The Uruguay river, far from being a barrier, always worked as a line of communication and exchange with the Brazilian side. Its closeness to São Borja — a historically important city, birthplace of Brazilian presidents — bound the two communities by commercial, family and cultural ties, in an area where Spanish, Portuguese and Guaraní mix.
The link was strengthened in the 1990s with the construction of the Puente Internacional de la Integración, which physically connected Santo Tomé with São Borja and joined the Mercosur transport corridors. Today Santo Tomé combines its role as a border crossing and farming center with growing interest in its Jesuit heritage and its river setting, in a corner of the deep Litoral where history, river and border live side by side.
In recent decades, the way Santo Tomé's mission past is seen has changed: what were for a long time almost forgotten ruins in the scrub came to be valued as first-rate historical and cultural heritage. Corrientes province drove the restoration of the San Carlos ruins, with a visitor center and a site museum that conserve and display the architectural remains and the objects of Guaraní life, bringing the site into the Jesuit-Guaraní Corridor that runs through the mission towns of Argentina, Paraguay and Brazil.
This regional circuit connects Santo Tomé and San Carlos with larger destinations such as San Ignacio Miní (in Misiones, a World Heritage Site) and the Brazilian missions of São Miguel das Missões, among others. For travelers, visiting these missions — some monumental, others intimate and solitary like San Carlos — makes it possible to piece together the story of that singular social and religious experiment and to grasp the deep Guaraní imprint on the whole region.
Today, Santo Tomé is trying to balance its traditional role as a farming city and border crossing with an emerging tourism focused on Jesuit history, the nature of the Uruguay river and sport fishing. Its quiet profile, its trilingual border identity (Spanish, Portuguese and Guaraní) and the nearby ruins make it a charming stop for anyone traveling the deep Litoral and the missions route, far from the big mass circuits.
Dorado fishing, in particular, has gained weight as a draw in its own right. The stretch of the Uruguay river skirting Santo Tomé is part of one of the best-known catch-and-release corridors in the basin, with local guides who know the fishing spots according to the season and the level of the river. That activity, added to border tourism with São Borja — a city that on its own attracts Argentines for its prices and its gaúcho identity — completes the profile of a many-sided destination: Jesuit history, the river and an international crossing, all a short distance from each other, something rare in a single point on the Corrientes map.