The
Ibaizabal river (
wide river in
Basque) drains southeastern
Biscay to the
Estuary of Bilbao. It is 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 is disputed which river is the one that actually reaches Bilbao. It is commonly agreed that it is the Nervion, but there are some who argue that the Ibaizabal carries more water (see name controversy).