SESIMBRA SNORKEL FIELD GUIDE
Under the Arco da Pombeira: a 3 km open-water swim from Sesimbra’s hidden pebble cove
A one-day, 3 km open-water swim from Sesimbra Marina to Praia da Baleeira that threads crevices, a dramatic natural arch and dense seaweed beds—this guide explains the route, conditions and meeting logistics.
Under the Arco da Pombeira: a 3 km open-water swim from Sesimbra’s hidden pebble cove.
Adventure brief
Under the Arco da Pombeira: a 3 km open-water swim from Sesimbra’s hidden pebble cove
Embark on an open-water swim at Praia da Baleeira, a small pebble beach tucked beneath the steep slopes of Cabo Espichel. The route threads secret passages and passes beneath a crevice and the Arco da Pombeira, moving through kelp-rich water that shelters shoals of local fish; after the swim there’s a convivial lunch in a local tavern and time to visit the Sesimbra coast.
Cabo Espichel’s rugged coastline offers a rare playground for open water swimmers, where the Atlantic’s cool waters meet soaring cliffs and hidden coves. Swim Together invites adventurers to a one-day, 3-kilometer swim tour starting from the quiet Marina de Sesimbra, south of Lisbon, Portugal. This isn’t just a swim—it's an intimate journey through Praia da Baleeira, a pebble beach tucked beneath steep cliffs and framed by the historic Forte S. Domingos da Baralha, once a sanctuary for local fishermen.
Participants glide alongside dense underwater forests of seaweed, a vital refuge for shoals of bream and salemas, sometimes even surprising swimmers with darting schools of fish. The route navigates secret passages carved by waves, notably passing under the dramatic Ponta da Passagem crevice and through the Arco da Pombeira, a towering natural arch that punctuates the seascape with its striking, sculpted granite form. This geological wonder is the highlight of the swim, offering both a physical challenge and a visual reward.
Safety and local expertise are paramount: experienced guides accompany swimmers and provide boat and kayak support for groups of eight or more. After the swim, travelers relax over a meal at a traditional tavern in Sesimbra, sampling authentic Portuguese flavors and uncovering the character of this coastal region.
Swim Together’s tour is more than a physical challenge; it’s a chance to connect with the unique environment of the Sesimbra area. The region’s blend of maritime heritage, geological features, and rich marine biodiversity make this tour a standout in Portugal’s outdoor adventure offerings. Whether you’re a seasoned open water swimmer or an outdoor enthusiast seeking an off-the-beaten-path experience, the Cabo Espichel Swim Tour offers an exhilarating way to engage with the Atlantic coast’s wild beauty.
Route Schematic
Route Schematic
Key stops along the swim and boat transfers, from meeting point to return.
Marina de Sesimbra
Group meets at Sesimbra Marina and departs by boat to Praia da Baleeira.
Ponta da Passagem (the Crevice)
Start the swimming tour here, passing under the crevice that gives the place its name.
Arco da Pombeira
Cross beneath the Arco da Pombeira—the imposing natural arch that constitutes the high point of the swim.
Chã dos Navegantes
Finish the swim at Chã dos Navegantes with views along the coast; the support boat meets the group for the return to Sesimbra village.
This is an open-water coastal swim covering approximately 3 km over a single day; the provided itinerary includes a support boat waiting at the finish and a return by boat to Sesimbra village.
Highlights
Outing Highlights
Cliffs, Crevices and the Arco da Pombeira
The high point of the swim is passing beneath the imposing Arco da Pombeira after emerging from the crevice at Ponta da Passagem—dramatic coastal geology framed by the steep slopes of Cabo Espichel.
Dense Seaweed Forests and Local Fish
Along the entire route you’ll swim through dense forests of seaweed that serve as refuge for marine species; swimmers may spot shoals of bream and salemas among the kelp.
Hidden Beach, Support Boat and Village Return
The tour departs from Sesimbra Marina by boat to Praia da Baleeira, finishes at Chã dos Navegantes where a support boat awaits, and returns to Sesimbra village—followed by lunch in a typical Portuguese tavern and a short visit to the region.
What the day feels like
What the swim feels like
The day unfolds as a short boat hop from Sesimbra Marina to a tucked pebble beach, then a sequential open-water swim along the shore that threads a named crevice, passes under the Arco da Pombeira and finishes at Chã dos Navegantes—an exposed coastal swim through kelp beds with a support boat standing by and the village lunch to follow.
Suitability
Who it's for
Suitability based on provided participant information.
Practical planner
Details to review before reserving
Duration: 1 Day; total swimming distance listed as approximately 3 km.
Water temperature ranges from about 14ºC to 22ºC (57ºF–72ºF); swimmers will pass through dense seaweed beds and coastal rock features.
Meeting point is Sesimbra Marina from where the group departs by boat to Praia da Baleeira.
Review cancellation policies before reserving.
Frequently asked questions
Planning Your Outing
How long is the trip and how far do we swim?
The outing is one day in duration and covers approximately 3 km of open-water swimming.
Where do we meet and how do we get to the swim start?
You meet at Sesimbra Marina; the group departs by boat to Praia da Baleeira.
What is the route during the swim?
The swim starts at Ponta da Passagem (passing under the crevice), continues through the Arco da Pombeira and finishes at Chã dos Navegantes where a support boat awaits for the return to Sesimbra.
What marine life might I see?
Swimmers may observe dense seaweed forests that shelter marine species and sometimes shoals of bream and salemas; the itinerary also notes that the return to Sesimbra village is occasionally accompanied by dolphins.
What is the water temperature I should expect?
Water temperature ranges roughly from 14ºC to 22ºC (57ºF–72ºF).
Is there a meal included after the swim?
After the swim you will enjoy a lunch in a typical Portuguese tavern as part of the itinerary, followed by a visit to the region.
How this guide was prepared
This field guide is synthesized using verified supplier specifications, route descriptions, and destination data. Some booking links may generate affiliate revenue for ADV Guides.
- Verified: 2026-08-18T00:11:25.614Z
Some booking links may generate revenue for ADV Guides or The Adventure Collective.
Availability, pricing, schedules and operating details can change.
Trip details and contextual sources were reviewed by ADV Guides Editorial.