Atsinanana is a region in eastern Madagascar. It borders Analanjirofo region in north, Alaotra-Mangoro in west, Vakinankaratra and Amoron'i Mania in southwest and Vatovavy-Fitovinany in south.
Atsinanana region is divided into seven districts:
The capital of the region is Toamasina, and the population was estimated to be 1,117,100 in 2004. The area of Atsinanana is 21,934 km2 (8,469 sq mi).