The Eastern Arc forests extend across a total of 23,800 km2 (9,200 sq. mi.) of mountainous landscape from the
Taita Hills on Kenya-Tanzania border through central Tanzania to the
Udzungwa Mountains in the southwest. The ecoregion includes numerous mountain blocks separated by lowland areas. The mountain form a broad arc curving to the northwest and southwest, and include the Taita Hills, North and South
Pare Mountains, East and West
Usambara Mountains,
Nguu Mountains, North and South
Nguru Mountains,
Ukaguru Mountains,
Uluguru Mountains,
Rubeho Mountains,
Uvidunda Mountains, and
Udzungwa Mountains. The ecoregion includes two outlying mountains, the
Mahenge Mountains south of the Udzungwas and
Malundwe Mountain in
Mikumi National Park. At lower elevations, the mountain forests are mostly surrounded by
Miombo woodlands. The southeastern-facing slopes, which receive more moisture-laden winds off the Indian Ocean, are home to transitional forests from 250 to 350 meters elevation up to 800 meters elevation. These transitional forests more closely resemble the lowland coastal forests to the east, and are considered part of the
Northern Zanzibar–Inhambane coastal forest mosaic ecoregion. To the southwest, the Makambako Gap, a region of Miombo woodland, separate the Eastern Arc forests from the
Southern Rift montane forest–grassland mosaic ecoregion in Tanzania's
Southern Highlands. ==Flora==