The Troia Peninsula: Beaches and Roman Ruins

The Tróia peninsula is a long finger of sand and pine forest across the Sado estuary from Setúbal, with miles of beaches on both the calm estuary side and the Atlantic side. It has a marina resort, Roman ruins and dolphins in the bay, and it’s the gateway to Comporta.

Quick answer: reach Tróia by ferry from Setúbal (cars and foot passengers), or drive round via Comporta. Swim at the calm estuary beaches or the long ocean beaches, visit the Roman ruins of a fish-salting complex, and watch for dolphins on the crossing. See places to stay in Comporta and Tróia.

Why go

Tróia gives you some of the best beaches within easy reach of Lisbon, with white sand, clear water and pine-backed dunes. The trip itself is part of the fun: a short boat ride across the Sado estuary with the Arrábida hills behind you. It’s quieter than the Lisbon coast, and you can easily carry on south to the rice fields and beaches of Comporta.

Things to do

• Beaches: calm, shallow water on the estuary side, and wilder surf on the ocean side.
• Roman ruins: the remains of one of the largest Roman fish-salting centres, with tanks, baths and a mausoleum.
• Dolphins: the Sado has a resident pod. See dolphin-watching trips.
• The marina resort: restaurants, a casino and golf.
• Birdwatching: the estuary is a nature reserve, created in 1980, and its mudflats and salt marshes draw flamingos and wading birds, especially in autumn and winter.
• Comporta: rice fields, stork nests and boutique stays. See Comporta.

The beaches

The estuary beaches near the northern tip face Setúbal and the Arrábida hills. The water is calm and shallow, which makes them good for children. The Atlantic side runs south in one long, open strand with bigger waves and plenty of space, even in summer. Raised wooden walkways cross the dunes to protect the plants, so stick to them.

The sand barely stops for roughly 45 km, past Comporta and Carvalhal towards Melides, so you can always find a quiet patch by driving a little further south. Beaches on the peninsula such as Tróia-Mar and Bico das Lulas have usually held Blue Flag status, with lifeguards in the bathing season.

The Roman ruins

From the 1st century AD, Tróia was a major centre for salting fish and making fish sauce, using the rich catches and the salt of the Sado. The site was lived in until about the 6th century. You walk past rows of stone salting tanks, a bath house, houses with upper floors and burial areas, all right on the edge of the estuary. Allow about an hour. The ruins open mainly in summer, usually from June to September on set days with a lunch break, and by appointment for groups at other times. Check current times and prices before you go.

The recent pattern has been Wednesday to Saturday in June and September and Tuesday to Saturday in July and August, from 10am to 1pm and 2.30pm to 6pm. A self-guided visit costs about €6, with reductions for students and over-65s, and children under 12 go free. The site usually closes for a few days in early August for the local festival of Nossa Senhora do Rosário de Tróia.

Dolphins

The Sado is home to one of the few resident groups of bottlenose dolphins in Europe. You may glimpse them from the ferry, but a boat trip from Setúbal or the Tróia marina gives you a much better chance.

The group is small, with about 25 animals, and many are old. To protect them, in recent summers the authorities have banned dolphin watching at the mouth of the estuary in August and limited trips at midday, so check what applies when you book and choose an operator that keeps its distance.

Getting there

• Passenger catamaran: Atlantic Ferries runs a foot-passenger catamaran from the centre of Setúbal to the Tróia marina. The crossing takes about 15 minutes and costs about €5 each way.
• Car ferry: the car ferry leaves from Setúbal’s Doca do Comércio and lands at Tróia’s south pier, a little further along the peninsula. It takes about 25 minutes and usually runs about once an hour. In 2026 a car with its driver costs about €21 each way, and each extra passenger pays a little over €5.
• By road: you can also drive round the estuary via Alcácer do Sal and Comporta. It’s much longer than the ferry from Setúbal, but handy if you’re coming from the south.
• From Lisbon: Setúbal is about 45 minutes by car, or reachable by train and bus. See Setúbal and Arrábida.

How long to spend

A day is enough for a beach and the ruins. Stay a night or two if you also want Comporta and a dolphin trip.

A suggested day

• Morning: catamaran from Setúbal, then a swim on the calm estuary beaches.
• Lunch: at the marina.
• Afternoon: the Roman ruins (in season), then the long Atlantic beach until sunset.

Food

Across the water, Setúbal is famous for choco frito, fried cuttlefish. You’ll also find grilled fish, clams and seafood rice around the estuary. Further south, Comporta’s rice fields supply the local rice dishes. Moscatel de Setúbal, a sweet fortified wine, is the classic local drink.

When to go

June to September is the beach season and the time the ruins are open. July and August weekends are busiest. Spring and early autumn are quieter, with pleasant weather for walking the dunes.

Tips

• Ferry: see ferries in Portugal.
• Summer: busy at weekends, so book the car ferry early.
• Without a car: the catamaran is quicker and lands right by the marina. The estuary beaches are walkable from the marina.
• Shade: there is little on the ocean beaches, so bring a sunshade and water.
• Return trips: if you came over on the car ferry, note the time of the last sailing back, which changes with the season.

FAQ

How do I get to Tróia from Lisbon without a car?

Take a Fertagus train or a coach to Setúbal, walk to the waterfront and catch the Atlantic Ferries catamaran, which takes about 15 minutes to the Tróia marina.

How much is the ferry to Tróia?

In 2026 the catamaran costs about €5 each way for foot passengers, and the car ferry about €21 each way for a car and driver. Check current fares with Atlantic Ferries.

Can you see dolphins from the Tróia ferry?

Sometimes. The Sado’s resident dolphins are often seen near the estuary mouth, but a dedicated boat trip gives you a much better chance.

Is Tróia good for children?

Yes. The estuary beaches near the marina have calm, shallow water, and they’re an easy walk from the catamaran. See Portugal with kids.

More: where to stay in Setúbal and the best beaches near Lisbon.

See also: dolphin watching in Portugal.

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