Tabatinga holds about 70,000 residents, making it the sixth most populous city in the state of Amazonas. The combined urban area with Leticia pushes past 100,000. But look at a road map of Brazil and the city simply is not connected. The nearest highway ends hundreds of kilometers east, across dense rainforest that no engineer has ever managed to bridge. The only surface connections are the river and the sky. Boats come upstream from Manaus in 36 hours on a speedboat, up to six days on a slow boat that carries cargo, hammocks, and passengers in roughly equal measure. The trip costs around R$370. Downstream from Iquitos in Peru, boats arrive in 9 to 10 hours by fast craft, three days by slow boat. The distance to Iquitos is 625 kilometers of river. Flights link Tabatinga to Manaus on Azul; flights from Leticia reach Bogota on Avianca and LATAM. This is Amazon geography, where the river and the runway do the work that roads do elsewhere.

Movement between Tabatinga, Leticia, and Santa Rosa is unrestricted in practice. No checkpoint stops pedestrians walking from one side of the invisible line to the other. But everyone gets stamped in and out of the correct countries when they need to move beyond the border area. The Brazilian immigration office sits midway down Tabatinga's main thoroughfare, Avenida da Amizade, next to the Federal Police station. It is only open Monday through Thursday. Colombian immigration operates out of Leticia airport. Peruvian immigration is in Santa Rosa, easy to find if you ask. The practical approach is to get just one exit stamp and one entry stamp per visit, since passing multiple times through immigration offices tends to frustrate officers who have seen too many confused backpackers. Brazilian reais, Colombian pesos, and Peruvian soles all circulate in town. Soles are slightly less welcome, but changing money at a local casa de cambio is easy enough.

The city traces its origins to the 17th century, when Jesuit missionaries founded a small village near the Solimoes. In 1766, the Portuguese crown installed a military post, a customs post, and a border marker, laying the institutional foundation for the later settlement of Sao Francisco Xavier de Tabatinga. The name itself comes from Tupi Guarani, a compound meaning white clay, after the pale sediment common in local riverbeds. The borders were not clearly drawn for another century. In 1866 a formal boundary between Brazil and Peru was surveyed near the village. In 1924 an updated marker between Tabatinga and Leticia fixed the Brazil-Colombia line. Tabatinga remained administratively subordinated to the municipality of Benjamin Constant until 10 December 1981, when the state of Amazonas emancipated the district into its own autonomous municipality. Municipal offices opened on 1 January 1983, making Tabatinga, for all its antiquity, a legally young city.

The tourism offerings in Tabatinga itself are modest. Two simple markers at the urban boundary let visitors stand at points where they can see all three countries simultaneously, both free to visit. The second is near the airport runway, about five minutes on foot from the first. For bigger experiences, most visitors walk across to Leticia, which has a better selection of hotels, restaurants, and jungle tour operators. From Santa Rosa, boats head upriver into the Peruvian Amazon, and from Tabatinga itself, the slow boats to Manaus offer a weeklong journey downstream through the heart of the forest. Hammocks, meals, and occasional monkeys are included. The voyage is widely regarded as one of the great river trips in South America: the forest closes around the boat, dolphins roll through the wake, and the distance between port cities becomes a function of patience rather than kilometers.