Fornells bay shelters the northern entrance to Menorca's marine reserve, a 5,119-hectare protected zone established in 1999 to safeguard posidonia oceanica meadows that anchor the Mediterranean food web.
The village sits at the mouth of a three-kilometre fjord-like inlet, its depth and orientation creating unusual shelter from the prevailing tramontana wind that shapes much of the island's northern exposure.
Snorkeling minorque fornells centres on limestone cave systems carved into the headlands flanking the bay. Cova dels Anglesos and Cova d'en Xeroi lie within twenty minutes by small boat, their submerged entrances opening into chambers where light refracts through saltwater in shifting columns. The seabed drops from two metres at the shoreline to fifteen metres at the reserve boundary, creating gradients that support grouper, octopus, and seasonal visits from loggerhead turtles tracked by OBSAM, the Balearic marine observatory.
The area's underwater topography reflects Menorca's status as a UNESCO Biosphere Reserve since 1993. Volcanic substrate from the Miocene epoch meets sedimentary deposits, forming overhangs colonised by red gorgonians and sponges. Morning visibility routinely exceeds twenty metres before afternoon thermals stir suspended particles. Water temperature peaks at twenty-six degrees in September, dropping to fourteen in February when the bay's resident population of fish retreat to deeper sections.
Five operators licensed by the Consell Insular run snorkeling minorque fornells tours from the harbour, their schedules aligned with tidal windows that optimise clarity. Excursions range from two-hour coastal surveys to half-day safaris reaching Illa dels Porros, a rocky islet seven kilometres offshore where pelagic species congregate. The marine reserve prohibits anchoring within marked zones, requiring boats to use permanent moorings installed by park rangers. This infrastructure supports roughly twelve thousand snorkel visits annually, a figure the reserve authority caps to prevent meadow degradation.
3 hr 30 min
