Isalo National Park: hikes, pools and how to visit

Isalo National Park is a sandstone massif in southern Madagascar, cut by canyons up to 200 m deep, with palm-lined pools you can swim in and ring-tailed lemurs on the rocks. You reach it from Ranohira, a small town on the RN7 about 700 km by road south of Antananarivo, and you can only walk the park with a local guide. Give it an evening for the Window of Isalo at sunset and a full day on the trails.

Both of our set trips through Isalo stay two nights in Ranohira: the Classic South heading down to the coast at Ifaty, and the Ultimate Madagascar Adventure coming up from it. They're private, with your own vehicle and driver-guide, and can be reshaped around the walking you want.

Is Isalo worth the drive?

If your trip heads south, yes. Ranohira is on the RN7 itself, so Isalo is a stop on the way to the coast rather than a detour. The walking is the point. Wildlife comes second: Madagascar National Parks counts seven lemur species here, against fourteen around Andasibe, so if rainforest lemurs are why you're going, Andasibe and Ranomafana matter more.

The catch is the way back. Antananarivo is 700 km up the road, which is why the Classic South ends with a flight from Toliara.

It's busy, too. Lonely Planet calls it Madagascar's most visited park, and a 2024 report in L'Express de Madagascar put it at about 200 visitors a day in high season. They bunch up in two places: the Piscine Naturelle and the Window at sunset.

The main hikes in Isalo, compared

Most visits use two parts of the park: the Piscine Naturelle and Namaza, from car parks a few kilometres outside Ranohira, and the two canyons further out. Times are Madagascar National Parks' own unless we say otherwise.

• Piscine Naturelle (the Natural Pool). The most popular pool in the park, about 3 km each way from the car park. It starts with a 20-minute climb of about 65 m, with steps built into the steep, slippery bits, then crosses the plateau to a pool fringed with Bismarck palms. Allow about three and a half hours there and back, plus stops and your swim.
• Namaza, the Cascade des Nymphes and the Black and Blue pools. A gentler walk up a green canyon: under a kilometre to the Namaza campsite, then on to a waterfall dropping off the plateau and two deep pools, the Piscine Noire and the Piscine Bleue. Rough Guides calls it the easiest trail in the park, about 1.5 km each way to the waterfall, with a steeper last climb to the pools. L'Express puts it at two to three hours.
• The loop that joins them. From the Piscine Naturelle a 3 km path crosses the plateau and drops about 180 m into the Namaza valley. Swim in the morning, eat lunch at the Namaza campsite, then do the waterfall and the pools in the afternoon. Allow six hours or more with stops, by our estimate. With one day in Isalo between April and November, this is the one we'd pick.
• Canyon des Makis and Canyon des Rats. About 17 km north of Ranohira, 45 minutes by car, mostly on a dirt road up the Manamaty valley. The Canyon des Makis is the easier one. The Canyon des Rats, 700 m further north, is a traditional burial area. Allow about three and a half hours for the Makis and four and a half for the Rats. Rough Guides makes it a long half-day for both, drive included.

Parts of the massif are burial ground, for the Bara and before them the Sakalava, so stay on the path your guide takes. And don't point at a tomb: in much of Madagascar that's fady, taboo.

How hard are the hikes?

Heat is the hard part of Isalo, more than the climbing. The plateau has little shade, while the canyon floors, with water and trees, stay cooler. Start early.

If you can walk for three or four hours with one short climb, you can do the Piscine Naturelle or the canyons. The full loop is a long day, and the 180 m drop into Namaza is hard on knees that already complain on stairs.

Carry at least two litres of water each (three on the full loop or in October and November), a hat, sun cream and shoes with some grip, plus swimwear and a small towel. From June to August add a warm layer for the early start and the evening at the Window.

The best time to visit Isalo

The park is open all year, and the dry months suit walking best. These are the World Meteorological Organization's 1991 to 2020 averages for Ranohira:

• April and May. The tail of the rains in April, then dry. Highs of about 26 to 28 °C.
• June to August. The coolest, driest stretch: highs of about 24 to 26 °C and nights around 11 to 12 °C, with almost no rain. July and August are the busy months.
• September. Still dry, and warmer at about 28 °C.
• October and November. The hottest months, with average highs of about 31 °C and around 20 days a month over 30 °C. The rains start in November. Walk at first light and keep the middle of the day for the pools.
• December to March. The wet season, with January the wettest month and summer storms. The park stays open, but France's travel advice warns against walking the canyons in the rains, especially in the afternoon, because sudden downpours can bring potentially deadly floods.

For the whole island, see The best time to visit Madagascar.

Park fees and guides

You can't walk in Isalo without a local guide. Tickets are validated at the park office in Ranohira, where guides are hired too, and the guide is paid per group on top of the ticket.

At the time of writing, Madagascar National Parks charges a foreign adult 65,000 ariary a day to enter, about 13 euros, according to its price board. It has announced that its fees will roughly double from late 2026 (1 November at most parks, according to the Malagasy press), and the press has put Isalo's new rate at 130,000 ariary, about 26 euros. Guide fees depend on the circuit and your group size. Check current rates, and whether the pools cost extra, with Madagascar National Parks before you go.

On our trips you don't deal with any of this: park entrance fees and local guides are in the price we quote.

How many days in Isalo, and which trip

Two nights suits most people. One night gets you the Window and a short walk before you drive on, and feels rushed. A third night covers both halves of the park, or buys you a night at one of the campsites inside the massif, at Namaza or the Piscine Naturelle. For more walking than that, Isalo also works as a multi-day trek, and we can add the days to either trip.

The Classic South (from €1,730 per adult, for two or more) is the natural fit if Isalo is on your list: eleven days from Andasibe's indri to the reef at Ifaty. The Ultimate Madagascar Adventure (from €3,070) adds the west, with the Tsiribihina River, the Grand Tsingy, Kirindy and the baobabs, before reaching Isalo from the coast. Current UK advice on the river is in our safety guide, and we can reshape the trip without it, for example by flying to Morondava for the west.

Tell us your dates and how much walking you want, on the booking form or WhatsApp. A real person in Antananarivo replies, usually within 24 hours, with a written itinerary and a firm price, and there's nothing to pay until you've seen them.

Photos: Falco Negenman, Marcelo Delgado and Guillermo Suarez on Unsplash.