Île Sainte-Marie: whales, beaches and how to get there

Île Sainte-Marie, also called Nosy Boraha, is a long, thin island off Madagascar's east coast, about 50 km from end to end and nowhere more than 7 km wide. It's best known for the humpback whales that gather in the channel between the island and the mainland from July to September, to mate and give birth. The rest of the year it's a quiet place of palm-backed beaches and small bungalow hotels, with Île aux Nattes off its southern tip. You get there on a flight of about an hour from Antananarivo, or by road to the coast and a boat across.

Two things to know before you book. It rains a lot, even in whale season. And the boat across is an open-sea crossing: the UK Foreign Office advises getting local advice on these ferries and checking the weather before you sail. Our 10-day Eastern Madagascar trip ends here with three nights on the island, after Andasibe and the Pangalanes Canal: private, with your own vehicle and driver-guide, from €1,620 per adult.

Whale watching on Île Sainte-Marie: when to go

Humpbacks spend the southern summer feeding in Antarctic waters, then swim thousands of kilometres north to breed. The channel off Sainte-Marie is one of their calving grounds, and a 2018 study notes that the first observation of a humpback birth was documented here. On our Eastern trip, whale watching is an option from July to September, with the first whales from June.

If you can pick your dates, the order of the season matters. A study of nearly 900 whale-watching trips in the channel found that groups without calves dominate the first month, and mothers with calves become more common after that, keeping mostly to shallow water within about 6 km of the coast. The rain eases off as the season goes on: July averages about 290 mm over some 22 days, August about 130 mm and September about 80 mm. So if whales are the reason you're coming, we'd aim for August or the first half of September, when there are usually more calves about and far less rain than in July.

Nobody can promise you a whale, and some days the sea is too rough to go out, so give yourself more than one chance.

How whale watching works, and the rules boats follow

Outings leave from the island by boat with a guide, and most last a few hours. Madagascar has a national code of conduct for watching whales, under a 2023 government order, and Cetamada, a marine mammal association with an office on Sainte-Marie, has trained guides and boat operators since 2013. The main rules:

• Boats slow down from 800 m out and match the whales' pace.
• They stay at least 100 m away.
• No more than three boats watch one group. Others wait about 600 m off.
• A boat stays at most an hour with adult whales, and 30 minutes with a mother and calf.
• No driving into a group, cutting across its path or chasing it.
• No swimming with the whales.

Before you go out, ask whether the boat follows the code and whether the guide has done Cetamada's training. A skipper who races up to a mother and calf for your photograph is breaking the rules, and it's fair to ask for the boat to back off.

Whale watching in Madagascar: Sainte-Marie, the south-west or the north

Our trips reach three whale coasts.

• Île Sainte-Marie, east coast. July to September, the first from June, on days 8 and 9 of the Eastern trip. Madagascar's tourism office calls the island the main destination of the humpback migration. The catch is the rain.
• The south-west coast. The Classic South ends with two nights at Ifaty, near Tulear, and from June to September whale watching is possible there as humpbacks migrate along the coast. Researchers have recorded whales passing the south-west coast from about June to October. It's the dry side of the island.
• The north, around Nosy Be. On the 12-day Northern Madagascar Adventure, whale season is July to September and the humpbacks arrive from late July. In season, day 10 pairs Nosy Iranja with a guided boat trip into open water to look for them. The 11-day north trip has no whale day.

Let the rest of your trip decide. Andasibe and the Pangalanes point to Sainte-Marie, and the RN7 to the south-west. If you want whales and dry weather together, the north and the south-west are far drier than Sainte-Marie in these months. Our Nosy Be guide covers the north.

Getting to Île Sainte-Marie: the flight or the boat

By air. The airport is in the south of the island, and the flight from Antananarivo takes about an hour. Schedules change and late cancellations happen, so don't book it for the same day as your flight home. On the Eastern trip you fly back to Antananarivo on day 10. That flight isn't included in the trip price, but we can book it for you, and our trip cost guide shows roughly what domestic flights add.

By road and boat. The other way is the RN2 to Toamasina, then north up the coast on the RN5 to Soanierana-Ivongo, about 160 km, where the ferries leave. Some boats also go from Mahambo, about 95 km north of Toamasina. At the time of writing, crossing times run from about an hour to three and a half, depending on the port, the boat and the sea, and boats don't always run every day. From Antananarivo in one go that's a very long day, and the UK, Canadian and French governments all advise against driving after dark. The Eastern trip breaks it up with a night at Mahambo and crosses on the morning of day 7, and that boat is included in the price.

What the travel advice says. The UK Foreign Office advises getting local advice on the ferries to Sainte-Marie and checking the weather locally before travelling, because there have been accidents caused by overcrowding, poor maintenance, poor crew training and unexpected squalls. Canada adds life jackets for every passenger, and no boat that looks overloaded. So ask any operator, us included, which boat they use and what happens if the crossing is cancelled. If you get badly seasick, fly both ways instead.

Rain, wind and cyclone season

Sainte-Marie is on the wet side of Madagascar: about 3,200 mm of rain a year on roughly 200 days, on the 1991 to 2020 averages. Bradt's advice is to expect several days of rain and wind at any time of year, with calm, sunny weather in between.

January to May is the wettest stretch, with 350 to 470 mm a month. June and July are wet too, with more than 20 rainy days each, right in whale season. August is drier, and September to November are the driest months, with 80 to 100 mm on roughly 10 to 12 rainy days. It's warm all year, with average highs of about 25 °C in July and 30 °C in January.

Cyclone season normally runs from November to April, and the east coast takes most of the hits, especially in February and March. Bradt says cyclones damage Sainte-Marie every few years, and in 2026 Cyclone Gezani made landfall at Toamasina, on this coast, on 10 February. If you travel between December and April, leave spare days. Month by month, see the best time to visit Madagascar.