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Isalo National Park was founded in 1962 and is administrated by Madagascar National Parks since 1997. The park is situated along the [[RN7]], a tarred road connecting the capital of [[Antananarivo]] with [[Tulear]]. The road is in very good condition and accessible all year round. From Antananarivo to [[Ranohira]], the door to Isalo, it takes about 15 hours by car (701km). From Tulear to Ranohira it is a 4-hour drive (250km). It is also possible to go by taxi-brousse. Buses leave daily from Fasan’ny Karana station in Tana, Antsimo station in Fianarantsoa and Sanfily station in Tulear.
The park spreads over an area of 81,540 hectares, with an average length of 59 kilometres and an average width of 22 kilometres. The perimeter of the park is 164 kilometres. The altitude varies from 514 metres to 1,268 metres and the canyons are up to 200 metres deep. The Isalo massif is a continental sandstone plateau, dating back to the Jurassic times. In the park are various sandy valleys and narrow canyons. Strongly attacked by erosion, the rocks vary in shape and composition. The soil in the park is rich in iron and aluminium.
In the eastern part of the park following rivers flow from north to south: Marandra, Tsiombivoly, Andriamanero, Andranonkova and Namaza Ianakandrarezo, all small tributary rivers of the Menamaty, a tributary river of Mangoky. In the western part following rivers stream from north to south: Sambay, Amboloando, Ankademoky, Sakamalio, Hoanga, Vohibasia, Andranomena and Sambalahitsara Analakira, all small tributary rivers of Malio, another tributary of the river Mangoky.
The climate is tropical dry, with an annual rainfall of 800-1000mm in the months of December to March and an average temperature of 17°C in June and 25°C in February.
Since centuries the [[Bara]] people dominate the Isalo region. Their main activities are livestock, especially [[zebu]], and agriculture.