From its primary source on the Paraná River, about  south of Reconquista, the San Javier flows generally south, parallel to the Paraná. It passes by San Javier and Helvecia. Its mouth does not discharge directly into the Paraná River but rather into several channels near Santa Rosa de Calchines.
The San Javier River originates in the Paraná River, located south of Reconquista. It flows southward, paralleling the Paraná River, passing by San Javier and Helvecia. Its final discharge point is not the main Paraná River but a network of channels near Santa Rosa de Calchines.