Cala Martina or Cala del Gesso: Tuscany Coast Verdict
Published 2026-09-15. Conditions described are typical and never guaranteed.
Here is the short answer before you scroll. If you are a confident swimmer or a keen snorkeller who wants the clearest water on this coast and is willing to trade a serviced day for a genuine wild swim, Cala del Gesso Beach below the cliffs of Monte Argentario is your cove. If you want the same clear water and good snorkelling but you also want a longer, quieter walk in, a thread of Italian history and the sense of a nature reserve rather than a headland, choose Cala Martina Beach on the Gulf of Follonica. Neither is a beach club. Neither has a bar, a lounger or reliable shade. Both reward the same kind of traveller and punish the same laziness, so the real decision is about access, seabed and the mood of the day you want.
Let me be blunt about what unites them, because it matters more than the differences. Both are free to enter and both are wild. Both list facilities as none on site, which means you carry your water, your food and your water shoes in, and you carry every scrap of rubbish out. Both list lifeguard cover as to be confirmed, which on a wild cove means treat the sea as unsupervised and swim within yourself. And both peak in June and September, when the water is warm and clear, the crowds thin and the walk in is cooler than the August furnace. If you want sunbeds, showers and a spritz brought to your towel, stop reading and look instead at a proper seaside town or a serviced strand. These two are for people who like the effort.
The water and the seabed, where the day is really won
Both coves are celebrated for clarity, and both deserve it, but the reason for the clarity differs and that changes the snorkelling. Cala del Gesso is a small cove of fine smooth pebbles, around two hundred metres long, and the water is described as clear, calm and full of fish, among the best snorkelling on this coast. The pale cliffs above and the pebble floor keep the sea bright and legible. You swim out along the clear edge and count the fish.
Cala Martina works differently. It is a small wild cove of coarse sand and pebbles, and its clarity comes from a rocky seabed that keeps the water very clear and full of life. Snorkellers here find more than shoals: octopus, starfish, sea urchins and fish over the rocks. So if your idea of a good snorkel is structure, ledges and creatures tucked into the rock, Cala Martina edges it. If you simply want to hang in glass clear water and watch fish move past a bright pebble floor, Cala del Gesso is the cleaner, simpler pleasure.
One practical note for either. Both have coarse or pebbly ground and little natural shade, so water shoes are close to essential and sun cover is not optional. Settle in early while you can find a spot with some shelter, because there is no built front to duck under when the sun climbs.
Getting there, the deciding factor for most readers
This is where the choice usually resolves itself, because the two coves ask for different legs and different logistics.
Cala del Gesso is reached by a steep path down of about twenty to twenty five minutes. You take the panoramic road on Monte Argentario to around kilometre 5.9 just after Cala Moresca, then Via dei Pionieri, then a paved path that ends in a short steep staircase. The catch is parking, which is very limited along the road, and the climb back up in the heat with everything you carried down. The elegant workaround is to arrive by boat from Porto Ercole, which skips the climb entirely and turns the day into a swim with a harbour lunch afterward.
Cala Martina asks for a longer but flatter effort: a coast path of around two kilometres and roughly forty minutes from Puntone, along the via delle Costiere inside the Bandite di Scarlino reserve, with fine sea views the whole way. There is no road right to the cove, which is exactly why it stays quiet. You can also come by sea, with boats from the tourist marina at Scarlino near Puntone.
So the access question is really about what kind of movement suits you. A short, steep descent and a stiff climb back, or a longer, gentle walk on the level with the reserve around you. Families with older children who like a proper hike, and cyclists, tend to prefer the Cala Martina approach. Strong swimmers who would rather spend their energy in the water than on the path, or anyone planning to arrive by boat, lean toward Cala del Gesso.
Who should choose Cala del Gesso
Pick the Monte Argentario cove if you are a strong swimmer or a snorkeller who is happy to walk down a steep path for clear water and quiet, and who is content to treat the day as a wild swim with a picnic. The ideal version of this day looks like this: arrive at opening, settle on the pebbles, snorkel the clear edge among the fish, then climb back up and drive round to Porto Ercole for a harbour lunch of just landed fish. It is a compact, high reward outing, best when you keep what you carry light because everything has to come down and back up that staircase.
It is the better call when the sea is calm and you want the purest, brightest water with the least fuss underwater, and when arriving by boat is on the table. It is the wrong call if the idea of hauling supplies up a steep climb in August heat fills you with dread, or if road parking anxiety would ruin your morning.
Who should choose Cala Martina
Pick the Scarlino reserve cove if you are a snorkeller or a walker who wants a wild, quiet cove with clear water over rock, a bit of history, and no interest whatsoever in sunbeds or a beach bar. The day here reads: walk the coast path in from Puntone in the morning, pass the Garibaldi bust, snorkel the rocky edge among the fish, then eat just landed fish back at the Scarlino marina or up in the hilltop village.
That Garibaldi detail is worth the paragraph. On 2 September 1849, fleeing the papal armies, Giuseppe Garibaldi boarded a fishing boat here and escaped along the coast. A half bust by the Grosseto sculptor Tolomeo Faccendi stands by the path down to the beach, marking the spot. It gives a wild little cove a genuine thread of Italian history, a quiet reward most beach crowds never bother to earn.
Cala Martina wins when you want the walk to be part of the pleasure, when the richer rocky seabed matters more to you than the simplest possible snorkel, and when the reserve setting, all Mediterranean scrub and pine, is exactly the mood you are after.
The situation that flips the answer
Say you have set your heart on Cala Martina for the reserve and the history, but a strong swell is running or the forty minute walk in the midday heat suddenly feels foolish with young children. On that day the shorter, snorkel first simplicity of Cala del Gesso, or a boat straight in from Porto Ercole, is the smarter move.
Flip it the other way. You planned Cala del Gesso, but you cannot face the steep staircase, road parking is full, and there is no boat to be had. On that day the level, scenic path to Cala Martina, which you can also ride by bike, is the calmer choice, and the payoff underwater is arguably richer.
Rule of thumb: choose Cala del Gesso for the shortest route to the brightest water, and Cala Martina for the better walk, the livelier rocky seabed and the history. Sea state, heat and whether a boat is available are what decide it on the day.
If both sound like too much work
Be honest with yourself about the wild swim commitment. If the no facilities reality does not appeal, this coast has gentler options. For singing pale quartz sand inside the same protected country, there is Cala Violina Beach, though it also asks for a walk in and a summer booking cap. For a real seaside town with bagni, a fishing harbour and long easy sand, look at Castiglione della Pescaia Beach. For pine shade and space over service, the long tombolo strip of Feniglia Beach is the natural pick. You can weigh all of these on the wider Tuscany Coast collection, and if you are travelling with children the family focused guide will save you some guesswork. Still torn between the two wild reserve coves near Scarlino? Our Cala Martina against Cala Violina verdict covers that neighbouring pairing in detail.
Want a serviced day instead, with a lounger and a lunch
Neither of these coves offers loungers, a bar or booking, and that is the point of them. If what you actually want is a proper beach club day, with a bed, some shade and a kitchen, browse the destination and enquire through the Tuscany Coast beach clubs page. Save Cala Martina and Cala del Gesso for the mornings when you feel like earning your swim.