Gaztelugatxe is a little island situated in the Bay of Biscay just outside the Spanish coast in Basque Country. The island is crowned by a small hermitage called San Juan de Gaztelugatxe dedicated to John the Baptist, that dates from the 10th century, but could be as early as the 9th century. With another small neighboring island, Aketze, they form a protected biotope that extends from the town of Bakio until Cape Matxitxako, on the Bay of Biscay.

The island is connected to the coast by a narrow path, crossing a two-arch stone bridge and the most magnificent staircase consisting of over 230 steps that lead to the hermitage.

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