Isalo: Madagascar's Forgotten Canyon

Isalo National Park is a sandstone massif in southern Madagascar, located along the RN7 between Antananarivo and Tuléar. Shaped by millions of years of erosion, it unfolds a landscape of deep canyons, rock formations and lush oases unlike anywhere else on the island.

Isalo at a glance

• Location: southern Madagascar, on the RN7, between Antananarivo and Tuléar
• Formation: Jurassic sandstone massif, around 200 million years old
• Don't miss: the Isalo Window, Monkey and Rat canyons, natural pools
• Wildlife: ring-tailed lemurs and other lemur species, often spotted near water sources
• Guide: required for park access
• Best time to visit: dry season, April to October

A massif shaped by time

The Isalo massif formed around 200 million years ago from Jurassic sandstone, patiently sculpted by wind and water. The result is a landscape of canyons, rocky outcrops and deep fissures, often compared to the American Southwest, yet unmistakably Malagasy in character.

Why is the Isalo Window so photographed?

No visit to Isalo is complete without its famous "Window," a natural rock arch that perfectly frames the sunset. It's one of the most photographed spots in Madagascar, and for good reason: the golden light streaming through the arch at day's end makes for a striking sight.

Canyons and natural pools

The park is home to several canyons accessible on foot, including the Monkey Canyon and the Rat Canyon, where streams have carved through the rock over centuries. Some trails lead to natural pools of cool water, true oases after a hike under the southern Malagasy sun.

What wildlife can you see in the park?

Isalo shelters several lemur species, including the ring-tailed lemur frequently spotted near water sources, alongside flora adapted to arid conditions: pachypodiums, aloes and a unique rock-dwelling vegetation that clings to the stone.

How to visit the park

The park sits along the legendary RN7, between Antananarivo and Tuléar, making it an essential stop for anyone traveling through southern Madagascar. Several hiking routes are available, from a few-hour stroll to a two-day trek with camping. A local guide, required for park access, can help tailor the choice to fitness level and available time.

Frequently asked questions

What's the best season to visit Isalo?

The dry season, from April to October, is ideal: trails are easier to navigate and temperatures are milder than during the rainy season.

Do I need a guide to visit the park?

Yes, access to Isalo National Park must be accompanied by a certified guide, which also improves your chances of spotting wildlife.

How much time should I plan for?

Half a day is enough for a glimpse, but a full day lets you combine several canyons with the Isalo Window at sunset.

Is Isalo accessible by public transport?

The park is served by taxi-brousse (bush taxis) running along the RN7 between Antananarivo and Tuléar, stopping at Ranohira, the village closest to the park entrance.