Snorkelling and diving in Ibiza: where, when and the seagrass

Ibiza Connects · Updated on October 16, 2026 · 11 min read

The first thing almost everyone says after putting their face in the water in Ibiza is the same: "you can see the bottom as if there were no water". That's neither luck nor marketing: it's the posidonia, the rocky seabed and a sea with no rivers to cloud it. This guide tells you where to put your mask on, when the water is at its best, how to start diving and what to look after so it stays that way.

Snorkelling in Ibiza: why the water is so clear

The explanation has a name: Posidonia oceanica. It's a flowering plant, found only in the Mediterranean, that forms meadows on sandy seabeds down to several tens of metres. It holds the sediment in place, dampens the waves, oxygenates the water (up to 20 litres of oxygen a day per square metre, according to scientific studies) and shelters hundreds of species. The dead leaves the sea leaves on the shore in winter aren't dirt: they protect the beach from erosion.

Between Ibiza and Formentera lies one of the best-preserved meadows in the Mediterranean. Genetic studies have found posidonia clones there covering kilometres of seabed and thought to be tens of thousands of years old: they're among the largest and oldest living things known. The meadows of Ses Salines Natural Park are part of the "Ibiza, Biodiversity and Culture" site, which UNESCO declared World Heritage in 1999 along with Dalt Vila and the Phoenician and Punic sites. The story behind that listing is in Ibiza history and heritage.

For snorkellers, this means three landscapes: green meadows swaying in the current, patches of white sand between them and rocks teeming with life along the edges of the coves. The most interesting part is usually where all three meet.

The best snorkelling spots in Ibiza, by area

The golden rule: look for coves with rocks on either side and get in from the sand. And check the wind, because you'll see nothing in a choppy cove. With an easterly, head west; with a northerly, south; with a westerly, east.

West coast (San Antonio and Sant Josep)

• Cala Comte: flat rocks, islets opposite and channels full of light. Watch the current between the coast and the islets, which can be strong.
• Cala Bassa: a sandy beach in the middle with rocks on both sides, an easy seabed and calm water. Good for beginners.
• Cala Salada and Cala Saladeta: very clear water and rock walls, with posidonia close by.
• Punta Galera: rock platforms for getting into the water without sand, and seabeds that drop off quickly. For confident swimmers.
• Cala Gració and Cala Gracioneta: small and close to San Antonio, perfect for an hour before lunch.
• Cala Codolar: a little cove between Cala Tarida and Cala Comte with rocks on both sides, much quieter than its neighbours.

South-west (Es Vedrà and around)

• Cala d'Hort: snorkelling with Es Vedrà as a backdrop. Varied rocky and posidonia seabeds on either side of the beach.
• Cala Llentrisca: remote, pebbly, with very clean water. You reach it on foot along a path or by boat.
• Cala Moli: small and sheltered between Cala Tarida and Cala Vedella, with rocks at both ends.

South (ses Salines)

• Sa Caleta: reddish rocks and shallow seabeds next to the Phoenician site. Good for children.
• The rocky ends of ses Salines and es Cavallet: at the ends of the beaches, over the natural park's meadows.

North (Sant Joan and Sant Miquel)

• Cala Xarraca: a wide bay with rocks and small caves. Very calm in a southerly wind.
• Es Pas de s'Illa and Cala des Moltons: next to Port de Sant Miquel, with clear water and few people if you arrive early.
• Port de Portinatx and Cala d'en Serra: rocky seabeds at the island's northern tip.

East (Santa Eulària and Sant Carles)

• Cala Mastella: tiny, surrounded by pines, with rocks on both sides.
• Cala Boix: dark sand and a stony seabed, very clean on days without an easterly.
• Tagomago: the islet off Santa Eulària and Sant Carles, with some of the richest waters around the island. Boat only.

For facilities, access and directions to each cove, see the Ibiza beaches guide.

Diving in Ibiza: centres, try dives and qualifications

Ibiza has a wide network of dive centres in San Antonio, Sant Josep (Cala Vedella, Cala Tarida), Port de Sant Miquel, Santa Eulària and Ibiza Town, most open from April to October and a few all year. They work with the usual international training agencies.

The options, from least to most:

Try dives are offered from age 8-10, depending on the agency. Before diving you'll be asked to fill in a medical questionnaire; if you have ear, heart or breathing problems, check with your doctor first. And don't fly in the 24 hours after a scuba dive.

Well-known dive sites:

• Es Vedrà and es Vedranell: walls, big boulders and abundant marine life. They've been a marine reserve since 2023, as has ses Bledes, the islets off San Antonio bay.
• Es Freus, between Ibiza and Formentera: the oldest marine reserve in the Pitiusas (1999), with more than 13,000 hectares of meadows, rocky shoals and islets.
• Tagomago and the north-east coast: a marine reserve since 2018, covering about 3,750 hectares between Punta des Jonc, s'Argamassa and the islet.
• The Don Pedro wreck: a cargo ship about 140 metres long that sank in July 2007 just after leaving Ibiza port. It lies at roughly 26 to 47 metres, so it's for advanced divers only.

If you'd rather reach those spots with your own group and snorkel from the boat, types and prices are in Ibiza boat trips.

Sea temperature in Ibiza month by month

The sea around the Pitiusas goes from about 15-16 °C in winter to 26-27 °C at the end of summer, according to the Consell de Formentera. This table gives a month-by-month idea (rough values; daily readings are published by Puertos del Estado):

September and October are the locals' secret: the sea has stored up all the summer heat and the coves have emptied. If you fancy coming in low season, see the best time to visit Ibiza.

Safety: buoys, boats, currents and jellyfish

Marker buoy. If you're heading away from the shore, tow a brightly coloured buoy tied to your waist. It tells boats someone is in the water and gives you something to hold on to if you get tired. It's the best investment of a snorkelling holiday.

Boats. In summer the coves fill with motorboats coming and going. Buoyed swimming zones (yellow buoys) are closed to boats, but outside them don't take chances: don't cross the mouths of coves or channels boats use.

Currents and wind. Between the coast and the islets, and off headlands, the current can be strong. Swim against it at the start so you come back with it. If the wind blows into the cove, the water clouds over and the swell gets annoying: switch coasts.

Jellyfish. Some summers they appear, especially the mauve stinger (Pelagia noctiluca), which stings quite badly. If you're stung, get out of the water, rinse with seawater (not fresh water), don't rub, remove any bits with tweezers and apply something cold. If there's a strong reaction, go to a health centre. First aid supplies are covered in pharmacies in Ibiza.

Sun. Float face down for an hour with your back to the sun and you'll burn without noticing. A rash vest works better than any sun cream.

Emergencies. 112 also covers the sea and coordinates with Salvamento Marítimo, the Spanish coastguard, which has its own emergency number, 900 202 202.

Protection rules: look but don't touch

In Ibiza's waters the rule is simple: look, don't touch, take nothing.

• Don't stand on or pull up the posidonia. It's protected in the Balearics, and anchoring on it is banned.
• Don't touch the fan mussels. The noble pen shell (Pinna nobilis), the large shell sticking up from the seabed, is critically endangered after a mass die-off across the Mediterranean since 2016. If you see a live one, it's a treasure: keep your distance.
• Don't pick up sea urchins, starfish or shells with the animal inside, and don't feed the fish.
• Mind your fins near the seabed and rocks: one kick breaks in seconds what takes years to grow.
• Don't use a speargun without a licence. Spearfishing has its own rules and is banned in the marine reserves.
• If you're on a boat, don't anchor on posidonia: use sand or a buoy. Fines and the other rules are in Ibiza rules for tourists.

Kit and common mistakes

What you need: a mask that fits well (test it in the shop by placing it on your face without the strap and breathing in through your nose), a snorkel, fins if you're going further out, a rash vest and a buoy. Full-face snorkel masks are comfortable for looking around, but you can't duck-dive in them and, if they're poor quality, stale air can build up; if you use one, stick to floating calmly.

Common mistakes:

1. Going to the wrong cove for the day's wind. Cloudy water and swell: check the forecast before you go.
2. Snorkelling in the middle of the beach. Sand on its own is a desert: the good stuff is on the rocks.
3. Swimming out without a buoy in coves with boat traffic.
4. Waiting until midday in August. First thing is better: fewer people, fewer boats and the clearest light.
5. Touching everything. That photo with a starfish out of the water kills it.

Sources and official information

• Formentera.es (Consell de Formentera) · Sea temperature and island facts
• Puertos del Estado · Sea forecasts and data (water temperature)
• Govern de les Illes Balears · Marine reserves: regulation of activities
• Formentera.es · Es Freus marine reserve
• Wikipedia · Ibiza, Biodiversity and Culture (World Heritage, 1999)
• Wikipedia · Posidonia oceanica
• Salvamento Marítimo · Emergencies at sea