Tabatinga is a municipality in the Tres Fronteras area of Northwestern Brazil. It is located in the Brazilian state of Amazonas. Its population was 45,293 (2007) and its area is 3,225 km². Together with the neighbouring Colombian city of Leticia and the Peruvian city of Santa Rosa, the urban area has more than 100,000 residents spread along the Amazon river
The first Portuguese settlement in the area was founded in the 18th century as a military outpost. It became an autonomous municipality on February 1, 1983 . Formerly, it was part of the Municipality of Benjamin Constant.