The Mentawai Islands rain forests are a tropical moist broadleaf forest ecoregion in Indonesia. It covers the Mentawai Islands, an archipelago in the Indian Ocean off the west coast of Sumatra. The islands have been separated from Sumatra since the mid-Pleistocene period, and their geographic isolation allowed the evolution of several endemic species, including 17 endemic mammals.
Geography
thumb|Mentawai Islands topography
The ecoregion has an area of 6,513 square kilometers, Other endemic mammals include the Mentawai treeshrew (Tupaia chrysogaster), Sipora flying squirrel (Hylopetes sipora), Mentawai long-tailed giant rat (Leopoldamys siporanus), Pagai spiny rat (Maxomys pagensis), Mentawai rat (Rattus lugens), Mentawi flying squirrel (Iomys sipora), Siberut flying squirrel (Petinomys lugens), and short-headed leaf-nosed bat (Hipposideros breviceps).