Lagoa das Emendadas: Lençóis Maranhenses' Wildest Lagoon

Lagoa das Emendadas sits in the interior dune field outside Santo Amaro do Maranhão, reachable only by a 6-kilometer guided round-trip hike from the nearest 4x4 drop-off. The lagoon — actually a chain of interconnected pools that merge at peak water — is at its deepest and most photogenic from June through September, when the rainy season has filled the valleys between the white dunes.

Most visitors reach it on the Circuito Lagoa das Emendadas, a half-day tour sold in Santo Amaro for around R$200–300 per person. Tours leave at two set times, roughly 9 a.m. and 2 p.m., and the afternoon departure often returns via a sunset viewpoint over the dunes. The morning slot is cooler and has softer light for photography; the afternoon slot trades heat for the chance to watch the light change over the water. Both slots fill up during July and August, so book a day or two ahead through your pousada.

Getting There and What the Hike Involves

The Santo Amaro gateway

The lagoon is not accessible from Barreirinhas, the larger and more popular gateway town on the park's eastern side. Barreirinhas serves the classic lagoons — Azul and Bonita — which sit closer to that town and are reached by short jeep rides. Emendadas belongs to the Santo Amaro side, about 4 hours by road from São Luís airport, and the two towns are not connected by a direct road across the park. Travelers who want both usually backtrack through the interior or commit to a multi-day crossing with a guide.

From Santo Amaro, an authorized 4x4 carries you about 45 minutes into the park to a permitted parking area. Private cars cannot enter the dune field; ICMBio, the federal agency managing the park, restricts vehicle access to credentialed operators. The drive itself crosses high dunes and shallow lagoons, and the vehicle often has to pick a line through sand that shifts after heavy rain.

The walk itself

From the parking area, the route is entirely on foot: roughly 1.5 to 2 hours of walking each way, with several dune climbs that are steep enough to slow a casual hiker. The total distance is about 6 kilometers round trip, but the soft sand makes it feel longer than the number suggests. Guides typically stop at two or three smaller lagoons on the way in, allowing a swim and a rest before the final climb to Emendadas.

Wear closed shoes or sandals with straps — flip-flops will slip on the sand and offer no protection from the heat. Bring at least 3 to 4 liters of water per person; there is no potable water anywhere on the route. A light long-sleeve layer helps against the sun and the wind that picks up on exposed ridges. The park has no mobile signal, so download any maps or reservations before leaving town.

What Makes Emendadas Different

Scale and solitude

The lagoon is larger and deeper than the lagoons typically visited from Barreirinhas, and the surrounding dunes are taller. Because access requires a real hike, the crowds are thinner. On a weekday in June, you may share the water with fewer than a dozen people — a contrast to the jeep-access lagoons, where dozens of visitors arrive in convoy.

The name "Emendadas" means "linked" or "joined" in Portuguese, and in a good water year the separate pools literally connect into one long body of water winding between the dunes. In a dry year, the chain breaks into isolated ponds, and the walk becomes a tour of shrinking puddles rather than a continuous lagoon. That variability is the main reason to check rainfall conditions before committing to the trip.

Water color and swimming

The water runs from deep blue in the deeper sections to pale green near the sandy edges, and it is fresh, not salty. The bottom is fine white sand, firm enough to walk on without shoes in most places. Fish are present in the lagoon — they arrive as eggs carried on birds' feet and survive the dry season in damp sand — and small ones will nibble at your legs if you stand still.

Swimming is allowed and is the main reward of the hike. The lagoon's depth varies by season, but in peak months the center is deep enough for actual swimming rather than wading. The far shore is usually empty; walk five minutes along the sand and you leave the group behind.

Practical Details for Planning

Tour costs and inclusions

Shared tours from Santo Amaro typically cost R$200 to R$300 per person as of 2026, including 4x4 transport, a guide, and park admission. A separate municipal tourist tax of about R$10 per person is sometimes collected separately. Private tours cost more but let you set the pace and departure time. Fees change with the season and operator — confirm current rates when booking.

Guides are required by park rules, and independent hiking into the dunes without a registered guide is not permitted. Local guide cooperatives such as Coopdunas charge R$80 to R$150 for guide services if you arrange transport separately, though most visitors find the packaged tour simpler. The visitor cap introduced for 2026 limits daily entries to 1,550 people across two time slots, and advance booking is mandatory — there are no on-site ticket sales.

Best months and conditions

The lagoon is fullest from June through September. July and August offer the most reliable combination of full water and clear skies, but they also bring the most visitors and the highest prices. May and the first half of June are a good compromise: the lagoons are nearly full and the crowds are lighter, though rain showers are still possible. By October, water levels drop noticeably and some pools begin to separate.

Daytime temperatures from June to September hover around 30°C, with the sand surface much hotter. The hike is exposed the entire way, so start early if you have the choice. Sunset tours that depart around 2 p.m. avoid the worst midday heat on the return leg and end with the light hitting the dunes from a low angle — a detail most tour descriptions bury at the bottom of the page.

Frequently Asked Questions

How long does the Lagoa das Emendadas tour take?

Most tours run about 5 hours door to door, including roughly 45 minutes of 4x4 driving each way and 1.5 to 2 hours of hiking each way. The morning departure typically returns around 1 p.m., the afternoon tour around 6:30 p.m.

Can I visit Lagoa das Emendadas from Barreirinhas?

Not practically. The lagoon sits on the Santo Amaro side of the park, and there is no direct route across the dune field from Barreirinhas. Travelers based in Barreirinhas usually see Lagoa Azul or Lagoa Bonita instead, which are closer and reached by shorter jeep transfers.

Is the hike difficult?

It is moderate but not technical. The round trip is about 6 kilometers on soft sand with several steep dune climbs, and the heat is the main challenge. Anyone in reasonable physical condition can manage it; travelers with knee problems or low heat tolerance should consider a private tour with a slower pace.

Do I need to book in advance?

Yes, especially between June and September. The park operates a daily visitor cap with fixed time slots, and tickets are sold only through authorized operators and advance e-tickets — not at the entrance. Your pousada can usually arrange a spot with a day or two of notice.

When is the lagoon at its best?

June through September, with July and August giving the fullest water and the most reliable weather. The lagoon's pools merge into a continuous chain only in good water years, so check recent rainfall before booking a trip in a dry season.