La Esponja is a small islet SE of Ibiza town, facing the Sal Rossa watchtower in the area of Platja d'en Bossa, not far from Ibiza harbour. Dive off the N side of the island where the anchor hits the sea bed 8 metres down. You first of all find a very steep slope covered with low-growing seaweed, which falls to the underwater plain of sand and Posidonia 30 metres below.
Without swimming all the way down and maintaining a depth which matches your experience, proceed around the wall keeping it always on your right. You soon come to some large rocky formations on the bottom, covered with bryo- zoans such as Pentapora fascialis, a colony of microscopic creatures typical of rocky seabeds at this depth. It's worth investigating any hollows in the rocky surface where shy brown meagre may be seeking a refuge.
Further on you come to another conical rock 27 metres down dotted with yellow anemone, which leads in a S direction to more large rocks in which conger eels sometimes shelter. Head back to La Esponja's shelf, now a vertical drop plunging 20 metres below the surface, and this immediately gives way to a tongue of rock with a promontory 12 metres below. Swim round this to begin on the NW side of La Esponja, where the seabed again is covered with rocks tumbled on top of each other. Turn your back on these and proceed along the rocky wall until you get back to the boat, thereby completing your circuit.
Map of Divesite by Fundació de Promoció Turística d'Eivissa