Aquário Encantado: Nobres' Natural Snorkelling Pool

Aquário Encantado is a 6-metre-deep natural spring pool in Vila Bom Jardim, roughly 12 km from the village along the MT-241 in Nobres, Mato Grosso. It holds about 90 square metres of turquoise water fed by three springs, and visitors float over shoals of dourados, piraputangas and piaus with mask and snorkel — no swimming ability required, because a life jacket is compulsory.

The pool sits on private land managed as the Recanto Ecológico da Lagoa Azul, and entry is not something you can arrange at the gate. Nobres operates a voucher system: you buy access through a registered local agency, usually at least a day ahead, and arrive with the voucher and a scheduled time slot. Turn up without one and staff will send you back to Bom Jardim. That single rule catches more travellers off guard than anything else about the place.

Getting There and How Visiting Works

From Cuiabá by road

The drive from Cuiabá runs about 150 km north on the BR-163 to Rosário Oeste, then along a secondary road to Bom Jardim district. Figure on 2 to 2.5 hours by car. There is no airport serving Nobres, so Marechal Rondon International in Cuiabá is the practical arrival point for almost everyone. Organised day trips leave Cuiabá around Avenida São Sebastião, run roughly 9.5 hours door to door, and bundle transport, a Portuguese-speaking guide, lunch, snorkelling gear and admission into one price — usually somewhere near US$90–95 per person. Independent travellers with a rental car get more flexibility on timing, though the last few kilometres to the spring are unpaved.

The voucher system

Agencies in Bom Jardim and Nobres sell timed vouchers, and local prices cluster around R$117 to R$150 per person for the aquarium plus the Rio Salobra float. Because daily visitor numbers are capped, popular slots in high season sell out — a walk-in attempt during July holidays is a genuinely bad bet. Buy the day before at the latest. Fees shift between seasons, so confirm current rates with the agency or the municipal tourism site before you commit.

Agencies typically issue one combined voucher covering several attractions, which is convenient if you plan to add Reino Encantado or Refúgio Água Azul in the same trip.

The Visit: What Actually Happens

The walk in and the pool itself

Your slot begins with a short walk of 400 to 500 metres through gallery forest along the spring's outflow. Guides brief you on the rules, hand out masks, snorkels, life vests and reef sandals, then you enter the water. Time in the aquarium pool is limited — usually around 30 minutes — and that limit is enforced. It sounds short. It is enough, provided you spend it looking down rather than posing for photos.

The clarity comes from the geology: limestone and dissolved minerals in the rock sharpen light reflection, so the bottom stays visible metres below and submerged trunks appear to hang in air. Look for the three spring eyes feeding the pool. Fish are curious rather than shy, and the resident shoals will drift within arm's reach if you stay still.

The Rio Salobra float

After the pool, most vouchers continue with a drift down the Rio Salobra, a stretch of roughly 700 metres that takes about an hour at floating pace. This is the part opinions divide on. Plenty of visitors find the aquarium far more striking than the river, so treat the pool as the main event and the float as a pleasant bonus. The current does the work; you steer with your hands and let the vest hold you up.

Bring nothing you cannot leave in the car. There is no dry storage once you head to the water, and phones have a habit of ending up in pockets. The reception area has hammocks — useful if you arrive early or wait out an afternoon shower.

Timing your slot

Light matters more than most guides admit. Mid-morning to early afternoon, when the sun sits high, gives the strongest blue and the deepest visibility. The facility opens at 08:00 and takes its last visitors around 16:00, daily. Aim for a slot between 10:00 and 14:00 if the agency offers a choice.

Seasons, Conditions and Practical Sense

The dry season, May through September, is when the water is at its clearest — less rain means less sediment washing into the basin, and the unpaved access road stays in better shape. That is also the busiest window, so book earlier. The wet months from October to April bring higher water volumes, greener forest and a real chance of afternoon downpours; visibility drops after heavy rain, and a float scheduled for 15:00 can be rained off. Water temperature stays comfortable year-round, which means the swim itself is never the problem.

A few things worth knowing before you go. The sun here is unforgiving — reflection off clear water multiplies UV exposure, and a life jacket tan line after 30 minutes face-down is not a joke. Rash guards beat sunscreen for the reef-safe reason and for staying warm. The site sees roughly 65 visitors a day on average across the week, so it never feels crowded in the water, but the reception and briefing area can bunch up when two agency groups arrive together. Non-swimmers are fine; children need supervision but are common visitors. Anyone with limited mobility should know the forest path is uneven and there is no paved access to the pool edge.

Combine the visit with the Lagoa das Araras sanctuary at dusk if you are staying overnight in Bom Jardim — macaws assemble there in numbers that make the aquarium's 30 minutes feel like the quiet half of the day.

Frequently Asked Questions

Do I need to book Aquário Encantado in advance?

Yes. Entry is sold only through registered local agencies, and arriving without a voucher means being refused at the entrance. Buy at least one day ahead; in the May–September dry season, book further out because daily visitor numbers are capped.

Can I visit without knowing how to swim?

Yes. Life jackets are mandatory and the float is done face-down at surface level, so swimming is never required. Guides accompany every group in the water, and the Rio Salobra drift carries you with the current for about 700 metres.

How long does the whole visit take?

Expect roughly 30 minutes in the aquarium pool plus about an hour on the Rio Salobra float, with another 20 to 30 minutes for the forest walk and briefing. Day trips from Cuiabá run around 9.5 hours including the 150 km drive each way.

When is the water clearest?

The dry season from May to September delivers the best visibility, since rain carries less sediment into the springs. Whatever the month, a slot between 10:00 and 14:00 gives the strongest overhead light and the most vivid blue.

What is the entrance fee?

Local agencies currently charge in the region of R$117 to R$150 per person for the aquarium combined with the Rio Salobra float, though rates vary by season and package. Fees are subject to change — check with a registered Bom Jardim agency or the Nobres tourism office for current prices.