The Important Bird Area (IBA) is a 160-hectare (400-acre) tract of land comprising much of the massif dominated by the 496-metre (1,627 ft) Mount Hachiroungou.

From the peak, ridges extend to the north, east and south, forming the Dzoumonyé catchment's watershed.

The IBA includes the upper slopes of Hachiroungou, which support mixed montane forest, the southern and eastern ridges, and the Mapouéra valley between them.

The northern ridge (towards the 472-metre [1,549 ft] peak of Mlima Dziani Bolé) is deforested and excluded from the IBA.

The massif is surrounded by cultivation and padza (areas of heavily degraded, largely unvegetated and agriculturally useless laterite soils caused by former overuse of the land).