Damien Enright: I lived near Ibiza’s national park and I didn’t even know it

I have just learned that on Ibiza, the island off the Spanish coast roughly opposite Barcelona, there’s a magnificent national park. During the years I intermittently lived there, I didn’t realise the area’s significance.
The island’s southern tip straggles away to a narrow neck, almost reaching the northern part of Formentera, the much smaller island below it. In between the two lies a shallow sea that is a veritable metropolis of marine life, edged with marshes and dunes.