Lagoa da Gaivota: The Giant Lagoon of Santo Amaro

Lagoa da Gaivota is a large, deep lagoon in the western sector of Lençóis Maranhenses National Park, reached from the village of Santo Amaro do Maranhão. For years it was billed as the park's most beautiful view — and the widest lagoon in the Santo Amaro area, reportedly stretching about 2 km at its peak. That reputation still fills the 4x4 seats, though the lagoon itself has changed.

The name survives on the tour circuit even after the original basin ruptured some years ago, letting its water escape into the dunes. Local guides now lead visitors to the remnant pools and to the neighbouring Lagoa da Andorinha, which holds water more reliably. Understanding that before you book is the difference between disappointment and a very good morning in the sand.

Getting There and the Shape of the Lagoon Today

Location and Access from Santo Amaro

Santo Amaro do Maranhão sits roughly 250 km from São Luís, the state capital and the reference airport (SLZ). The final stretch into the village used to demand 4x4 traction, and although road improvements have eased the approach, independent drivers still face deep sand near the Alegre River crossing. Most travellers take a bus or shared transfer to the Sangue junction and switch to a local Toyota 4x4 for the last leg — a ride of about two hours that costs around R$15–R$30 depending on the operator and season.

From the village, the lagoon circuit is short. Accredited 4x4 vehicles reach the lagoon edge in roughly 15–20 minutes, which leaves most of a four-hour tour for swimming rather than driving. That proximity is the main practical argument for basing yourself in Santo Amaro instead of Barreirinhas, which is about 100 km east and serves a different set of lagoons.

What Happened to the Water

The Gaivota of the postcards was a perennial lagoon with a 2 km span — big enough to double as a filming location for the Brazilian feature Casa de Areia. Then the dune that held it gave way. Water drained, sand moved in, and the basin shrank to a fraction of its former size. Guides are candid about this if you ask directly; the circuit name was kept because it is what visitors search for.

The practical consequence: do not book this trip expecting a single vast lake. What you get is a chain of smaller lagoons — Andorinha, sometimes Serra, and the remaining pools near the Gaivota site — set in the same spectacular white dune field. Water levels vary year to year, so ask your guide on arrival which lagoons are actually full that week.

The Circuit, the Swimming, and When to Go

A Typical Half-Day Route

The standard tour runs about four hours and combines Lagoa da Andorinha with the Gaivota area, with an optional stop at Lagoa da Serra. Departures cluster around 8:30–9:00 am and again in the mid-afternoon for sunset, when the light turns the water a hard turquoise and the dunes glow orange. Morning trips are cooler and better for swimming; the sunset run is better for photography.

Vehicles park within a few dozen metres of the water on this circuit, so travellers who cannot manage long walks in soft sand are well served. The advantage is unusual in the park — at many Lençóis lagoons you hike 20–40 minutes from the road. Bring water, sunscreen and a hat regardless; shade is essentially nonexistent once you leave the vehicle.

Water Levels and the Best Months

The lagoons fill during the February–May rains and peak from June through September. June is the safest bet: even shallow depressions are brimming, and the sand-water contrast is at its strongest. By late August the smaller pools begin evaporating, and from October onward many disappear entirely, leaving a plain of white sand.

April to June also brings water close to the village, making it possible to walk to some lagoons without a vehicle — a genuinely different experience, with very few other tourists on the trail. From July the accessible water recedes and 4x4 tours become the sensible choice. If you visit in November, as some travellers do, expect dry lagoons but excellent dune walking and no crowds.

Costs and Booking

A shared 4x4 tour from Santo Amaro typically costs R$100–R$150 per person, and guided walks run cheaper. Tours are organised through the local drivers' cooperative rather than a single online platform, so arrange them at your pousada or the village cooperative office on arrival. Payment is often cash. Prices shift with fuel costs and group size — confirm the current rate locally, as figures change and are not centrally published.

National park entry is not included in most tour prices and is charged separately at the park checkpoint. Independent walking is permitted on established routes, but the dunes are unmarked, phone signal is unreliable, and guides consistently advise against setting out alone without GPS or a local escort.

Frequently Asked Questions

Is Lagoa da Gaivota still worth visiting?

Yes, but for the dune scenery and the neighbouring Andorinha lagoon rather than a single giant lake. The original basin ruptured years ago and its water drained, so the famous 2 km expanse is gone. Ask your guide which pools are full before you commit.

How long does the tour take from Santo Amaro?

About four hours, including hotel pickup and drop-off. The drive to the lagoon edge is only 15–20 minutes, so most of that time is spent swimming and walking the dunes. Sunset departures are timed to put you on a high dune at golden hour.

Can I walk to the lagoon without a guide?

It is possible from April to June, when water sits close to the village, and some travellers do it in about 90 minutes each way. The dunes are unmarked and easy to misjudge, so most guides advise against going alone. Carry at least two litres of water per person.

What is the best month to see the lagoon full?

June. The rains have just ended, every depression holds water, and the sand is at its whitest. July and August remain good, but the shallower pools start shrinking from late August, and by October many are dry.