Alaotra-Mangoro is a region in eastern Madagascar. It borders Sofia Region in north, Analanjirofo in northeast, Atsinanana in east, Vakinankaratra in southwest, Analamanga in west and Betsiboka in northwest. The capital of the region is Ambatondrazaka, and the population was estimated to be 877,700 in 2004. The area of the region is 31,948 km2 (12,335 sq mi).