The ecoregion stretches 500 km from west to east across western and central Java. This mountainous region, historically known as Parahyangan, is only 30-80 km wide. Major volcanoes, from west to east, include Mount Salak, Mount Pangrango, Mount Guntur, Galunggung, Mount Cereme, Mount Slamet, Mount Sindoro, Mount Sumbing, and Mount Merbabu. The highest elevation is at Mount Slamet. The ecoregion is completely surrounded by the Western Java rain forests ecoregion at lower elevations.