A tiny uninhabited island just north of Formentera, reachable by boat excursion from La Savina port (about 15–20 minutes). Multiple operators run daily trips — book the day before at the port. The island has pristine white sand beaches, turquoise water even clearer than Formentera, and a famous natural mud bath spot (Es Racó de s'Alga) where you can cover yourself in mineral-rich mud. There are ZERO services on the island — no restaurants, no toilets, no shade, no drinking water. Pack everything: food, water, sunscreen, umbrella, towels. The mud baths are fun for kids but haven't been scientifically proven to have health benefits. Don't try to walk across from Formentera — the crossing (Pas de s'Espalmador) looks shallow but has dangerous currents. Always take a boat. Plan 3–4 hours for the excursion.