Rio da Prata: Snorkeling Brazil's Clearest River

Rio da Prata, a spring-fed river 48 km from Bonito, offers a 2.2 km snorkeling float through water so clear you can count the scales on a fish 15 meters away. The Recanto Ecológico Rio da Prata has operated on Fazenda Cabeceira do Prata since 1995, and the full tour — trail plus float — takes about four hours, with tickets around R$ 470 in low season.

What to Expect on the Rio da Prata Float

The float is split into two distinct sections, and that split matters more than most guides admit. The first 1,650 meters run through the Olho d'Água spring, where visibility often exceeds 30 meters. You drift over white limestone sand past schools of piraputanga, curimbatá, and the occasional pacu, all with almost no effort — the current does the work. A short trail connects the two stretches, then the final 600 meters follow the main Rio da Prata channel, where the water turns a deep turquoise and the fish grow noticeably larger.

The Olho d'Água Spring Section

This is the part people photograph. Water temperature holds at 21°C year-round, so you never need a wetsuit — a 3 mm neoprene top is plenty if you chill easily. Groups are capped at 10 snorkelers per guide, and you enter the water in a slow, single-file line to avoid kicking up sediment. The bottom is a mix of sand and submerged logs, and the light on a sunny morning turns the whole river into a moving stained-glass window. I would skip the optional photo package — the guide's GoPro shots are fine, but you will want both hands free for the current.

The Rio da Prata Channel

The second half is shorter but wider, and the fish here are the draw: pintado, dourado, and matrinxã, some pushing 60 cm. The water is slightly less transparent than the spring — still 20-plus meters of visibility on a good day — but the size of the fish compensates. You exit at a wooden platform, and the walk back to the reception area takes about 10 minutes through riparian forest. Keep an eye out for coatis raiding the snack bins; they are bold and will unzip a backpack if you leave it unattended.

Planning Your Visit: Tickets, Rules, and Timing

Reservations are mandatory and must go through a Bonito agency — you cannot simply show up at the gate. Prices are fixed across agencies, so the only variable is high versus low season. In 2026, expect R$ 470 in low season and R$ 570 in high season for the standard float, which includes equipment and a buffet lunch at the farm. The minimum age is 5 or 6 depending on the source — some agencies list 5, others 6, so confirm when booking if you have a young child. Maximum weight is 120 kg per participant.

How to Get There

The reserve sits at BR-267, Km 512, in the rural municipality of Jardim, technically just outside Bonito. Most visitors drive — about 45 minutes from Bonito's center via MS-178 — and there is no public bus. Agency transfers add roughly R$ 80–100 per person round-trip. If you have a rental car, the drive is straightforward and well signposted, but the last 8 km are dirt road, so avoid a low-clearance vehicle after heavy rain.

Best Time to Go

The dry season from April to October delivers the most reliable visibility. July through September is peak: rivers at their clearest, sunny days, and crisp winter mornings that make the 21°C water feel warmer than it is. The wet season from November to March can cloud the water for a day or two after heavy rain, though the spring-fed sections recover quickly. Morning entry times — 8:30 or 9:00 — give you the best light and the fewest people in the water. I would avoid the 10:30 slot in high season; you will be sharing the spring with three or four other groups.

What to Bring and What to Leave Behind

Bring a swimsuit worn under your clothes, a quick-dry towel, and reef-safe sunscreen. Leave behind anything you do not want to carry on the trail — there are lockers at reception, but they are small. Waterproof phone cases are sold at the gift shop for about R$ 40, though the staff will tell you (correctly) that you will not need your phone in the water. The buffet lunch is included and surprisingly good: grilled fish, rice, beans, and a doce de leite made on the farm that regulars scrape from the pan while it is still warm.

Frequently Asked Questions

How long does the Rio da Prata tour take?

About four hours door to door from Bonito, including transport, the 1,650-meter trail, the float, and lunch. The float itself lasts roughly two hours, and you should budget another 45 minutes for the forest walk and safety briefing.

Can I do the Rio da Prata float without a guide?

No. All snorkelers enter the water with a certified guide, and groups are limited to 10 people. The rule exists to protect the riverbed and keep the experience calm — independent floating is not permitted at any time.

Is Rio da Prata suitable for children and non-swimmers?

Yes, with caveats. Children aged 5 or 6 and up can participate, and non-swimmers do fine because the current carries you and a life vest is optional but available. That said, the water is 2–3 meters deep in places, so nervous swimmers should mention it to the guide before entering.

What is the water temperature at Rio da Prata?

The spring stays at a constant 21°C (70°F) year-round. That feels cool on a winter morning and refreshing on a summer afternoon, but it never drops low enough to require a full wetsuit — a rash guard is enough for most people.