Found in tropical moist lowland and montane forests in southeastern Madagascar, the collared brown lemur occurs west to the forests of Kalambatritra and in the south from Tôlanaro north to the Mananara River.
He received information that a large French ship was sighted close in shore at Port Daupine, Madagascar.
It is most common in the south of the island, around Tôlanaro, though it is found as far north as the Masoala Peninsula.