Ibaizabal
Ibaizabal river in Abadiño
Origin	near Elorrio
Mouth	Cantabric sea
Basin countries	Spain
Length	43 km
Avg. discharge	11.8 m³/s
Basin area	1900 km²

The river Ibaizabal (wide river in Basque) drains southeastern Biscay to the Estuary of Bilbao. It is 43 km long from its source at Elorrio to the Nervion, and it passes by the towns of Durango and Amorebieta and joins the Nervion river at Basauri. Both rivers run then together for a short length until they merge with the sea at Bilbao. It's disputed which river is the one that actually reaches Bilbao. It's commonly agreed that it is the Nervion but there are some who argue that the Ibaizabal carries more water (see name controversy).

Coordinates: 43°14′24″N 2°52′34″W / 43.240°N 2.876°W / 43.240; -2.876

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