Río que tributa sus aguas al Añarbe por su margen izquierda. Nace a los 1° 54' 25" y 43° 09' 35" (Hojas n.° 65 y 90), al SE. del término de Goizueta (Navarra) a más de 1.000 m. de altura. Su cuenca alta está constituida por el barranco del Ama.
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