The Concepción River (or just Concepción) is a river in Chiapas, Mexico.
Other rivers There is also a Rio Concepción in Sonora, Mexico (30.528027, -112.98392).
See also List of longest rivers of Mexico List of rivers of Mexico
References
The Prentice Hall American World Atlas, 1984. Rand McNally, The New International Atlas, 1993.