The San Javier River (Spanish, Río San Javier[1]) is an anabranch (arm or side channel) of the Paraná River in the province of Santa Fe, Argentina.
The lower Paraná River is highly braided, with a complex system of channels on either side of the main stem.
Its mouth does not discharge directly into the Paraná River but rather into several channels near Santa Rosa de Calchines.
[2] The mouth of the San Javier River is located at 31°29′50″S 60°20′32″W / 31.49722°S 60.34222°W / -31.49722; -60.34222,[3] about 40 kilometres (25 mi) northeast of Santa Fe City, the provincial capital.
[4] The distance from its source to its mouth is about 250 kilometres (160 mi), over which it flows in a highly meandering and braided course.