It borders Sofia Region in north, Analanjirofo in northeast, Atsinanana in east, Vakinankaratra in southwest, Analamanga in west and Betsiboka in northwest.

[4] Alaotra-Mangoro Region is divided into five districts, which are sub-divided into 82 communes.

The region is mainly populated by the Sihanaka in the north, and the Bezanozano in the south.

[5] With 120.000 ha of planted surface, the region constitutes the main rice basin of Madagascar.

Livestock (Zebu) reaches 265.000 heads and fishing 2000-2500 tons per year.