General location: 22�22 and 22�40 southern latitude / 45�11 and 45�23 longitude
Location and Access: 683 km southwest of Antananarivo, 279 km southwest Fianarantsoa, 243 km northeast of Toliara.
Climate: Dry tropical forest and savanna
Average temperature: 17-25�C
Elevation: 820 to 1240 m
Precipitation: 85 cm
Description: Isalo's landscape consists of eroded ruiniform sandstone formations dating to the Jurassic period, deep canyons with riparian forests, palm-lined oases, fire-resistant tapia forests, and open grasslands.
FLORA: Isalo is known for its pachypodes (Pachypodium ), aloe and euphorbiums.
The following vegetation zones are found in the park:
Riparian forest found along rivers in the canyons of Isalo
Scattered sclerophyle forest made up of fire-resistant Tapia (Uapaca bojeri) and Heza (Astropeia micraster)
Rupicolous vegetation found on rocky surfaces and consisting of Pachypodiums (Pachypodium geayi, Pachypodium willlamarai, Pachypodium rosulatum, Pachypodium horombese, and Pachypodium densiflorum); Aloes (Aloe acutissima, Aloe isalensis and Aloe detoideodonta); and a species of Kalanchoes
Dry forest on alluvial deposits. Families: 99 Species: 340
