Réunion's Whale Swim Rule: 9:00 to 13:00, Explained

The short answer first. In Réunion you may enter the water near whales only from 1 July to 30 September, only between 9:00 and 13:00, for 30 minutes at most, and with no more than seven people including the guide. Boats can keep watching later in the day. So the rule is "mornings and midday in the water", not "mornings only".

Réunion is a French island in the Indian Ocean, east of Madagascar. Every southern winter, humpback whales come to its warm water to breed. The island's rules around them are very detailed, and they are worth reading slowly.

What the Réunion swim with whales rule really says

The rules come from a local order, arrêté préfectoral n°944 of 4 June 2025, modified by arrêté n°1098 of 27 June 2025. Each year before the season, the Prefecture reminds everyone of them.

Here is the simple version. Close observation is allowed from 1 July to 30 September. A maximum of three boats may be with the same group of whales or dolphins at the same time. Up to seven people may go into the water, and that includes the guide. Each water entry lasts 30 minutes at most, and it is allowed only between 9:00 and 13:00.

Boats may watch from 9:00 to 16:00, and until 18:00 only if they are decarbonised boats. Within 300 metres of the animals, boats must slow to 4 knots. And on the west coast, between the Bay of Saint-Paul and Grand Cap, there is a seasonal speed limit of 10 knots from 1 July to 30 September.

So the honest summary is not "morning-only". It is "9:00 to 13:00, in the water". The afternoon belongs to boats watching from a distance, and after 16:00 only quiet, low-emission boats may stay, until 18:00.

Why did Réunion make the rule stricter?

The rule did not come from nowhere. GLOBICE, the association that studies whales and dolphins around Réunion, describes the 2024 season as marked by an explosion in the number of whale-watching boats. Getting into the water had become normal. Respect for the rules was at its lowest level in the data of CEDTM, another local cetacean group. And there was a visible impact on the whales.

It was not the first attempt. A voluntary charter existed from 2003, and binding rules followed from 2018, because the guidelines were not respected.

When the new order was presented in June 2025, the stated goal was to balance tourism and the protection of marine life. Controls were to be reinforced at sea and on land, and people who break the rules face administrative and criminal sanctions.

I could not find an official sentence that explains why the cut-off is exactly 13:00, so I will not invent one. What I can say is what the rule does in practice. It gives the whales a long part of every day with no swimmers around them at all, and it limits how many boats and bodies can surround one group at once.

Why the whales come so close to shore

Humpbacks are around Réunion from June to October. They feed in Antarctica during the southern summer, then travel several thousand kilometres to warm water to breed. Mothers with calves prefer the calm water along the coast, where they nurse their young.

This is the heart of it. The whales that are easiest for people to reach are often the most sensitive ones: a mother resting and feeding a small calf in shallow water.

Numbers also change a lot from year to year. GLOBICE reports between 13 and 1,156 different individuals identified per season since 2004. In one recent low season, there were so few humpbacks that the team could deploy only one acoustic tag. When there are fewer whales, the pressure from boats and swimmers falls on fewer animals, which is one more reason no honest person should promise you a whale.

The same researchers concluded that the whales of Réunion do not form a separate population. So a good rule here protects whales that belong to a much bigger ocean story.

Legal is not the same as best

Something can be legal and still not be the gentlest choice. GLOBICE says it simply: "the most responsible observation is the one done from the coast" (our translation). That comes from the team that studies these whales every season.

Watching from land is not a second prize here. Because mothers and calves like the calm coastal water, whales can sometimes be seen from shore. GLOBICE's free app, Balèn terla, lets anyone report humpbacks seen from the coast and see other people's sightings. It now has more than 57,000 users, and from June to September an average of 921 people used it each day.

I find this beautiful: thousands of people looking at the same sea, and nobody needing to get close.

How to enjoy Réunion's whales gently

From shore, bring binoculars, patience and a quiet spot on the west coast cliffs, and share what you see through Balèn terla.

From a boat, choose an operator who knows the 2025 order and follows it without argument: no more than three boats per group, 4 knots within 300 metres, and water entry only between 9:00 and 13:00. A good operator tells you before the trip that you may not get in the water at all, and stops the approach when a mother and calf change direction. I keep my phone and a dry layer in a small roll-top dry bag, so a long, patient wait on deck stays easy.

If you are ever in the water, stay at the surface, stay together and stay calm. Never swim towards a whale, never cut its path, never go between a mother and her calf, and never touch. Let the whale decide the distance.

Wildlife encounters are unpredictable. Swimming with whales should always follow local regulations and experienced professional guidance.

If you are comparing islands, our look at Moʻorea, Tonga and Réunion shows how differently each place writes its rules. It is also why we keep our Moʻorea whale groups small, and follow the local rules there exactly as they are written.

Questions people ask

Wildlife encounters are never guaranteed and never forced. Ocean Calling works only with vetted, ethical local operators, and every animal is free to approach, or not, entirely on its own terms.