Aquário Natural: Bonito's Original Snorkel Float

Aquário Natural sits on the Baía Bonita River, 7 km from downtown Bonito along the MS-178 road toward Guia Lopes da Laguna. It was the first floating tour opened to the public in Bonito, and the spring itself stays at a constant 23°C (73°F) year-round, so the water feels the same in July as it does in January.

The name is literal. Visibility here reaches up to 30 metres in the dry season, and the river bed is packed with aquatic plants and schools of piraputanga and corumbata — fish that have grown so accustomed to snorkellers that they barely move aside. You float roughly 800 to 900 metres, depending on which operator's numbers you follow, from the spring down to the confluence with the Formosinho River.

How the Visit Works

The trail and the training pool

Every tour starts at the reception building on the Baía Bonita Ecological Reserve, where you're issued a neoprene suit, buoyancy vest, mask and snorkel. There's a pool on site used for a short practice session — 10 to 15 minutes of breathing through the snorkel before you commit to the river. I'd rate this as genuinely useful for first-timers rather than a box-ticking exercise; the mask fogging up is the main thing beginners struggle with, and the pool is where you sort it out.

From there a trail of roughly 500 to 700 metres runs through riparian forest to the spring platform. It's flat, partly shaded, and takes about 10 minutes at an unhurried pace.

The float itself

The in-water section lasts around 40 minutes at a gentle drift — you don't swim so much as steer. A support boat trails the group the whole way, so anyone who tires or gets cold can climb aboard without cutting the tour short. Water depth varies but the current is mild; the operator classifies the difficulty as easy.

At the end there's a short side stop at the Formosinho River with a small zipline (tirolesa) into the water — included in the ticket, and worth doing once.

Group size and physics

Each floating slot is capped at 9 people to limit environmental impact. Neoprene suits fit up to about 120 kg on some operators' gear and 140 kg on others, so confirm your size when booking. Minimum age is generally 4. Total activity time runs 2.5 hours, though door-to-door with hotel transfer you should budget 3.5 to 4 hours.

Tickets, Timing and Practical Details

Prices and booking

You cannot show up and pay at the gate. Aquário Natural is visited only as part of a booked tour with a fixed time slot, and numbers per slot are limited — reserve at least a few days ahead in high season (December to March and July). Rates for 2026 sit around R$352 for adults and R$308 for children in low season, rising to roughly R$436 for adults in high season. Transport from Bonito is usually charged separately, around R$50 per person on the shared van. Fees change — check the official site or your agency for current rates.

Getting there

The reserve is a 10-minute drive from the centre. Most visitors book a package with shared hotel pickup, which is the simplest option since the access road is unsealed at the end. If you're driving yourself, take the Bonito–Guia Lopes da Laguna highway to km 7; there's parking at the reception.

What to bring

Swimwear under your clothes, a towel, insect repellent, cash for photos and snacks, and a camera. Leave jewellery in the hotel — the reserve asks you not to wear sunscreen or repellent in the water, as both degrade the spring. That's a rule most visitors don't know in advance, and it matters: the low-nutrient water is the entire reason visibility is this good.

When to Go and What You'll See

Water clarity by season

Bonito's dry season, May to September, delivers the sharpest visibility — August is the peak. The rainy months from December to March raise river levels and stir up sediment, dropping clarity considerably. Water temperature barely shifts, holding between 21°C and 24°C all year, which means a 7 a.m. float in winter is bracing on exit but perfectly comfortable once you're in.

One timing detail worth knowing: December is piracema, the fish spawning migration, and the number of fish visible along the route drops noticeably. If fish are your priority, aim for April through November.

What lives in the river

Around 35 fish species inhabit the Baía Bonita. The ones you'll notice most are the dourado and the piraputanga — the latter a silvery fish up to about 35 cm that travels in loose packs and shows almost no fear of snorkellers. Piranhas are present in the region but are not a hazard here; the water is clear and the fish are well fed by the reserve's no-feeding policy, which is strictly enforced.

Who this suits

This is the closest float to town and the easiest entry point into Bonito's snorkelling circuit. If you have limited time or you're travelling with children or nervous swimmers, do this one first. Strong snorkellers who want longer routes and bigger fish concentrations tend to prefer Rio da Prata, about 55 km out — but that's a full day, and Aquário Natural fits neatly into a half-day slot.

Frequently Asked Questions

Can I visit Aquário Natural without a tour?

No. Entry is exclusively through pre-booked guided tours with assigned time slots, and each float is limited to 9 people. Book through a Bonito agency or directly with the reserve at least a few days ahead; in July and December, a week is safer.

How long does the whole visit take?

The in-water float is about 40 minutes and the full activity at the reserve runs 2.5 hours including the trail and training pool. Add transport from Bonito and you're looking at 3.5 to 4 hours door to door. Morning slots starting around 7:00 to 9:00 are common and leave the afternoon free.

Is it suitable for non-swimmers?

Yes. The buoyancy vest keeps you floating face-down without any swimming, and a support boat follows the group the entire 800 to 900 metres. There's a practice pool at reception before you enter the river, and the minimum age is 4.

What's the water temperature and visibility?

The spring holds a constant 23°C (73°F) year-round, so wetsuit or not, you won't be cold. Visibility reaches up to 30 metres in the dry season (May to September) and drops in the December-to-March rains. December also coincides with the fish spawning migration, when fewer fish are visible.