Distribution. NE & E Madagascar from the Mananara River in the N to the Mangoro and Onive rivers in the S; although the precise distributional limits are unknown, the Diademed Sifaka is thought to be the most widely distributed of the sifakas, occurring throughout Madagascar's E rainforests. Historically, its distribution extended farther N to just S of the Antainambalana River, but it has not been found in recent years during fairly extensive studies of that region. in Indriidae

Distribution. NE & E Madagascar from the Mananara River in the N to the Mangoro and Onive rivers in the S; although the precise distributional limits are unknown, the Diademed Sifaka is thought to be the most widely distributed of the sifakas, occurring throughout Madagascar's E rainforests. Historically, its distribution extended farther N to just S of the Antainambalana River, but it has not been found in recent years during fairly extensive studies of that region.