DiveCodex/log

Roca Muladera

Also known as: La Muladera

Twin-rock canyon boat dive at 0-25 m in Tossa de Mar, endorsed by local centres as the area's best site for a grouper sighting and rich in nudibranchs.

Last updated April 2026

Roca Muladera
© Jouni Kuisma

The dive

Two rocks frame a canyon at 8 metres where the anchor sits. The larger rock breaks the surface; the secondary one rises to 3 m. Heading south with the main rock on the left, the canyon walls close in and sunlight enters from behind. Dream Dive calls the backlighting magnificent. Morays and conger eels occupy the crevices. Nudibranchs cluster on the wall surfaces, rewarding a slow pace. At 24 m the canyon opens to sand. This is where the groupers tend to be. The return follows the opposite face of the main rock at shallower depth. The half-tank rule works well here: turn at 100 bar and track back up the canyon. Lobsters and octopus keep the safety stop productive.

What makes it special

TossaSub rates this the top dive on the Tossa seabed. The grouper association is specific to this site. Of all the Tossa boat points, Roca Muladera is the one where local centres set the expectation that a dusky grouper sighting is a reasonable outcome, not a lucky break. The canyon layout gives the dive a second draw. Distinct formations at different depths create a natural orientation exercise, and TossaSub explicitly recommends the site for navigation practice. Beginners stay in the shallow section. Divers with good air consumption take the deeper route. The guide flexes the plan to the group. A 2010 community trip report captures the site's pull: "there was so much life we've decided to come back next Saturday."

Know before you go

Boat only. Ten minutes from Tossa port, longer from Lloret. Do not attempt a shore swim: a local club owner warned a group that the current made it unsuitable, and the group who tried it compared the experience to Navy SEAL training. Air management matters. The deeper canyon sections sit at 20-25 m. Start deep, ascend gradually. The site is exposed between Tossa and Lloret, so strong northerlies (tramontana) or easterlies can cancel the dive. Centres substitute Mar Menuda on those days. Macro photographers should bring a torch for the nudibranch crevices. Wide-angle works for the backlit canyon.

Why Dive Roca Muladera

What makes this dive site stand out.

  1. 1
    Grouper endorsement from centres

    TossaSub names this the best Tossa site if you want to see dusky groupers.

  2. 2
    Nudibranch-rich canyon walls

    Nudibranchs concentrate on canyon walls and around the safety stop zone.

  3. 3
    Twin-rock canyon formation

    Two rocks with a canyon between them, anchor at 8 m, backlit walls for photography.

  4. 4
    Navigation training site

    Distinct rock formations and depth zones make it a go-to for orientation practice.

Depth & Profile

0m
Min depth
25m
Max depth
17–19m
Typical range
ReefCanyonRockSandPosidonia

Location

41.7071°N, 2.9142°E

Conditions

Temperature
13°C – 26°C
Visibility
10–25m
Current
mild

Difficulty & Certification

EasyMin cert: OW

Easy in the shallow zone. The deeper canyon end adds depth management. No overhead environment. Clear reference points throughout.

Frequently Asked Questions

Why do local centres call Roca Muladera the top dive in Tossa?▾
TossaSub describes it as the 'top dive of Tossa's seabed' and specifically recommends it for grouper encounters. The canyon layout between twin rocks adds a visual dimension most Tossa sites lack, and the flexible depth range means guides can build different routes for different groups on the same dive.
Will I see groupers at Roca Muladera?▾
Grouper sightings are more likely here than at other Tossa sites. TossaSub endorses it as a good choice for seeing dusky groupers. The deeper end of the canyon (20+ m) is where larger specimens hold territory. Sightings are not guaranteed, but this is the one Tossa site where centres set that expectation.
What is the canyon like?▾
A natural gap between the main rock (breaks the surface) and a secondary rock at 3 m depth. The anchor drops into the canyon at 8 m. Heading south with the main rock on the left, the walls frame sunlight as backlight effects along the gap. The canyon floor reaches 24 m before opening to sand.
Is Roca Muladera suitable for Open Water divers?▾
The shallow zone at 8-15 m is accessible to OW-certified divers. The deeper canyon (20-25 m) exceeds the 18 m OW limit and is reserved for AOW divers or those with equivalent certification. Guides commonly adjust the route to keep less experienced divers in the shallower sections.
What macro life can I photograph here?▾
Nudibranchs are the macro highlight. They concentrate on the canyon walls and around the safety stop zone. Morays and conger eels occupy crevices throughout. Scorpionfish sit on ledges. For the best results, bring a macro lens and a torch for the shaded crevices.
Can I dive Roca Muladera from Lloret de Mar?▾
Yes. Centres in Lloret and Cala Canyelles include Roca Muladera in their boat dive offerings. The ride is longer than from Tossa port, but the site is the same.
When is the best time to dive Roca Muladera?▾
May through October for warm water and marine life activity. September and October are considered the sweet spot: water still warm, visibility improving after summer plankton, fewer boats. Winter offers the best visibility and seasonal species like John Dory.

Photos

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