Ereño is a town and municipality located in the province of Biscay, in the autonomous community of the Basque Country, northern Spain.

There are literary references that call Ereño the "capital of the marble route".

According to historian Tomás de Goikolea, Ereño was built in the 9th century and the residents of the town may be direct descendants of the inhabitants of the Santimamiñe cave.

On 29 September, the San Miguel festival, a popular mass is held and a pilgrimage is done.

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