Formentera, Ibiza's diminutive neighbour just one hour's ferry-boat ride (or 25 minutes by hydrofoil) to the south, is an island apart in some ways more like a desert island than a satellite or outpost of Ibiza.
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Formentera is a one hour ferry-boat ride from Ibiza.
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Formentera is incredibly far from Ibiza, needing a three hour ferry-boat ride in order to arrive there.